Serena Williams feels targeted for drug testing

Serena Williams is back to being a threat on the tennis court and, according to her, that means it is time for an inordinate amount of drug tests.

Williams took to social media Tuesday night to complain about her latest test, which she says she is subject to more than other American tennis players.

."..and it's that time of the day to get "randomly" drug tested and only test Serena. Out of all the players it's been proven I'm the one getting tested the most. Discrimination? I think so. At least I'll be keeping the sport clean #StayPositive," she wrote in a tweet.

"But I'm ready to do whatever it takes to have a clean sport so bring it on. I'm excited," she said in a followup tweet.

Williams is coming off a loss to Angelique Kerber in the Wimbledon final, just her fourth tournament since sitting out a year because of her pregnancy.

The 23-time Grand Slam winner has reportedly already been tested five times in 2018 alone, more than any other U.S. player -- male or female.

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Serena Williams at Wimbledon 2018
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Serena Williams at Wimbledon 2018
10th July 2018, All England Lawn Tennis and Croquet Club, London, England; The Wimbledon Tennis Championships, Day 8; Serena Williams (USA) a she pulsl backs to win her game against Camila Giorgi (ITA) (photo by John Patrick Fletcher/Action Plus via Getty Images)
TOPSHOT - US player Serena Williams returns against Italy's Camila Giorgi during their women's singles quarter-final match on the eighth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - JULY 10: Serena Williams (USA) during her victory against Camila Giorgi (ITA) in their Ladies' Quarter Final match at All England Lawn Tennis and Croquet Club on July 10, 2018 in London, England. (Photo by Rob Newell - CameraSport via Getty Images)
LONDON, ENGLAND - JULY 10: Serena Williams of the United States plays a backhand against Camila Giorgi of Italy during their Ladies' Singles Quarter-Finals match on day eight of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 10, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)
US player Serena Williams leaves the court after wining against Italy's Camila Giorgi during their women's singles quarter-final match on the eighth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2018. - Williams won the match 3-6, 6-3, 6-4. (Photo by Oli SCARFF / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read OLI SCARFF/AFP/Getty Images)
US player Serena Williams celebrates breaking serve to go 3-1 up in the final set against Italy's Camila Giorgi during their women's singles quarter-final match on the eighth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2018. (Photo by Oli SCARFF / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read OLI SCARFF/AFP/Getty Images)
US player Serena Williams arrives at the training courts on the eighth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 10, 2018. (Photo by Oli SCARFF / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read OLI SCARFF/AFP/Getty Images)
US player Serena Williams serves to Russia's Evgeniya Rodina in their women's singles fourth round match on the seventh day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 9, 2018. (Photo by Oli SCARFF / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read OLI SCARFF/AFP/Getty Images)
LONDON, ENGLAND - JULY 09: Serena Williams (USA) during her victory against Evgeniya Rodina (RUS) in their Ladies' Singles Fourth Round match at All England Lawn Tennis and Croquet Club on July 9, 2018 in London, England. (Photo by Rob Newell - CameraSport via Getty Images)
LONDON, ENGLAND - JULY 06: Serena Williams of USA during her third round match against Kristina Mladenovic of France on day five of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2018 in London, England. (Photo by Visionhaus/Corbis via Getty Images)
US player Serena Williams celebrates after beating France's Kristina Mladenovic 7-5, 7-6 in their women's singles third round match on the fifth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 6, 2018. (Photo by Glyn KIRK / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP/Getty Images)
Serena Williams celebrates her win against Kristina Mladenovic on day five of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by Steven Paston/PA Images via Getty Images)
LONDON, ENG - JULY 04: SERENA WILLIAMS (USA) during day three match of the 2018 Wimbledon on July 4, 2018, at All England Lawn Tennis and Croquet Club in London,England. (Photo by Chaz Niell/Icon Sportswire via Getty Images)
Serena Williams serves on day five of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by Steven Paston/PA Images via Getty Images)
LONDON, ENGLAND - JULY 04: Serena Williams of The United States reacts during her Ladies' Singles second round match against Viktoriya Tomova of Bulgaria on day three of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 4, 2018 in London, England. (Photo by Clive Mason/Getty Images)
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