Golfer Jordan Spieth unsure about taking part in Rio

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Will U.S. Golf Stars Play in Olympics?

Twice major winner Jordan Spieth is still undecided about whether to participate in August's Rio de Janeiro Olympic Games or opt out because of the Zika virus like several of his fellow professionals.

The American world number two is the highest-ranked golfer left in the field after number one Jason Day withdrew on Tuesday, citing concerns over Zika, a mosquito-borne virus that the World Health Organization says is spreading rapidly in the Americas.

"Right now, I'm uncertain," Spieth told reporters ahead of the WGC-Bridgestone Invitational.

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"I have not received enough information to make an informed decision either way or not so as we gather more information I will be able to make a decision one way or the other.

"When I feel confident, I will make a decision either side."

Golf is returning to the Olympics for the first time since 1904, but the Games have already been hit by several high-profile withdrawals.

Ireland's Shane Lowry, the world number 25, also withdrew on Tuesday, saying his decision was based on firm medical advice.

JORDAN SPIETH IN PICTURES:

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Jordan Spieth timeline
Jordan Spieth, 16, a junior at Jesuit College Preparatory School in Dallas, looks on at his shot off the 12th tee during the first round of the Byron Nelson golf tournament Thursday, May 20, 2010, in Irving, Texas. Spieth finished even through 11 when play was suspended for the day. (AP Photo/Tony Gutierrez)
Golfer Jordan Spieth, left, and his caddie during the Byron Nelson golf tournament Friday, May 21, 2010, in Irving, Texas. (AP Photo/Tony Gutierrez)
Jordan Spieth during the second round of the Byron Nelson Championship golf tournament Friday, May 27, 2011, in Irving, Texas. (AP Photo/Tony Gutierrez)
Amateur Jordan Spieth lines up his putt on the ninth hole during the first round of play at the Byron Nelson Championship golf tournament in Irving, Texas, Thursday, May 26, 2011. (AP Photo/Matt Strasen)
Jordan Spieth watches his tee shot on the sixth hole during the third round of the Texas Open golf tournament, Saturday, April 21, 2012, in San Antonio. (AP Photo/Eric Gay)
Jordan Spieth chips onto the 14th green from a bunker during the third round of the AT&T National golf tournament at Congressional Country Club, Saturday, June 29, 2013, in Bethesda, Md. (AP Photo/Patrick Semansky)
Jordan Spieth holds the trophy after winning the John Deere Classic golf tournament, Sunday, July 14, 2013, at TPC Deere Run in Silvis, Ill. Spieth defeated Zach Johnson and David Hearn on the fifth hole of a playoff. (AP Photo/Charlie Neibergall)
United States team player Jordan Spieth competes in the Presidents Cup golf tournament at Muirfield Village Golf Club Thursday, Oct. 3, 2013, in Dublin, Ohio. (AP Photo/Jay LaPrete)
United States team player Jordan Spieth competes in the Presidents Cup golf tournament at Muirfield Village Golf Club Thursday, Oct. 3, 2013, in Dublin, Ohio. (AP Photo/Jay LaPrete)
United States team player Jordan Spieth, right, and teammate Phil Mickelson hold the Presidents Cup after the U.S. won the Presidents Cup golf tournament at Muirfield Village Golf Club Sunday, Oct. 6, 2013, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Jordan Spieth in action during the final round of the Tournament of Champions golf tournament, Monday, Jan. 6, 2014, in Kapalua, Hawaii. (AP Photo/Marco Garcia)
Jordan Spieth putts on the 14th green during the third round of the Tournament of Champions golf tournament, Sunday, Jan. 5, 2014, in Kapalua, Hawaii. (AP Photo/Marco Garcia)
Jordan Spieth hits from a sand trap on the 10th hole during the first round of the Valero Texas Open golf tournament, Thursday, March 27, 2014, in San Antonio. Play was delayed for more than two hours Thursday due to rain and fog. (AP Photo/Eric Gay)
Jordan Spieth hits a chip shot on the 13th hole in his match against Ernie Els, of South Africa, during the fourth round of the Match Play Championship golf tournament on Saturday, Feb. 22, 2014, in Marana, Ariz. (AP Photo/Matt York)
Jordan Spieth hits from the 18th tee during a practice round for The Players championship golf tournament at TPC Sawgrass in Ponte Vedra Beach, Fla., Tuesday, May 6, 2014. (AP Photo/John Raoux)
Jordan Spieth talks to the media during a news conference for U.S. Open golf tournament in Pinehurst, N.C., Monday, June 9, 2014. (AP Photo/Chris Carlson)
Jordan Spieth watches his shot from the 14th tee during the final round of The Players championship golf tournament at TPC Sawgrass, Sunday, May 11, 2014 in Ponte Vedra Beach, Fla. (AP Photo/John Raoux)
Jordan Spieth of the US attends a press conference ahead of the Ryder Cup golf tournament at Gleneagles, Scotland, Tuesday, Sept. 23, 2014. (AP Photo/Scott Heppell)
Jordan Spieth of the US celebrates putting out to win the 10th hole during the fourball match on the second day of the Ryder Cup golf tournament at Gleneagles, Scotland, Saturday, Sept. 27, 2014. (AP Photo/Alastair Grant)
Jordan Spieth tees off from the 15th hole during the final round of the Hero World Challenge golf tournament on Sunday, Dec. 7, 2014, in Windermere, Fla. (AP Photo/Willie J. Allen Jr.)
Jordan Spieth holds up his ball after a biride on the eighth hole during the second round of the Masters golf tournament Friday, April 10, 2015, in Augusta, Ga. (AP Photo/Chris Carlson)
Jordan Spieth poses with his trophy after winning the Valspar Championship golf tournament in a three-hole playoff Sunday, March 15, 2015, at Innisbrook in Palm Harbor, Fla. (AP Photo/Chris O'Meara)
Jordan Spieth holds up his ball after a birdie on the eighth hole during the fourth round of the Masters golf tournament Sunday, April 12, 2015, in Augusta, Ga. (AP Photo/Darron Cummings)
Jordan Spieth poses with his green jacket after winning the Masters golf tournament Sunday, April 12, 2015, in Augusta, Ga. (AP Photo/Matt Slocum)
Masters golf champion Jordan Spieth is interviewed during the "After the Bell" television program, on the Fox Business Network, Tuesday, April 14, 2015, in New York. Nothing annoys the 21-year-old more than a nickname some players have given him — Golden Child. (AP Photo/Richard Drew)
Jordan Spieth blasts from the sand trap on the 16th hole during a practice round at The Players Championship golf tournament Wednesday, May 6, 2015, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)
Jordan Spieth plays in the Memorial golf tournament Sunday, June 7, 2015, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Jordan Spieth hits out of the bunker on the ninth hole during a practice round for the U.S. Open golf tournament at Chambers Bay on Tuesday, June 16, 2015 in University Place, Wash. (AP Photo/Charlie Riedel)
FILE - In this Sunday, June 21, 2015, file photo, Jordan Spieth holds up the trophy after winning the U.S. Open golf tournament at Chambers Bay in University Place, Wash. Spieth loves golf history, which is appropriate for someone quickly becoming part of it. He is halfway home to the Grand Slam. (AP Photo/Ted S. Warren, File)
Jordan Spieth poses with the John Deere Classic trophy after winning the tournament by defeating Tom Gillis on the second playoff hole Sunday, July 12, 2015, in Silvis, Ill. (AP Photo/Charles Rex Arbogast)
Jordan Spieth watches his tee shot on the second hole during the third round of the John Deere Classic golf tournament Saturday, July 11, 2015, in Silvis, Ill. (AP Photo/Charles Rex Arbogast)
United States’ Jordan Spieth follows his shot from the fifth tee during a practice round at the British Open Golf Championship at the Old Course, St. Andrews, Scotland, Tuesday, July 14, 2015. (AP Photo/Jon Super)
United States’ Jordan Spieth speaks during a news conference ahead of a practice round at the British Open Golf Championship at the Old Course, St. Andrews, Scotland, Wednesday, July 15, 2015. (AP Photo/Peter Morrison)
Photo by: KGC-243/STAR MAX/IPx 2015 7/14/15 Jordan Spieth is seen on the third day of practice rounds for The British Open Golf Championship at the Royal and Ancient Golf Club of St. Andrews. (Fife, Scotland, UK)
United States’ Jordan Spieth drives a ball from the fifth tee during the first round of the British Open Golf Championship at the Old Course, St. Andrews, Scotland, Thursday, July 16, 2015. (AP Photo/David J. Phillip)
United States’ Jordan Spieth drives the ball from the 15th tee during the first round of the British Open Golf Championship at the Old Course, St. Andrews, Scotland, Thursday, July 16, 2015. (AP Photo/David J. Phillip)
United States'€™ Jordan Spieth prepares to take a shot on the 15th hole during the first round of the British Open Golf Championship at the Old Course, St. Andrews, Scotland, Thursday, July 16, 2015. (AP Photo/David J. Phillip)
Jordan Spieth hits out of a bunker on the 15th hole during the first round of the PGA Championship golf tournament Thursday, Aug. 13, 2015, at Whistling Straits in Haven, Wis. (AP Photo/Jae Hong)
SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States watches his tee shot on the fifth hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Jamie Squire/Getty Images)
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World number four Rory McIlroy pulled out this month, saying the risk of contracting Zika was one he was "unwilling to take".

Fiji's Vijay Singh and Charl Schwartzel of South Africa, have also withdrawn because of the virus, along with Australia's Marc Leishman.

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World number eight Adam Scott has confirmed he will not travel to Rio because of his busy schedule.

The Zika virus can cause crippling defects in babies and has been linked to the neurological disorder Guillain-Barre in adults.

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