Porsche has joined Nike and Swiss watch brand Tag Heuer in suspending ties with Tennis star Maria Sharapova.
Tennis player Maria Sharapova said that she recently received a letter saying she had failed a drug test at the Australian Open.
CNBC's Dominic Chu reporting that tennis star Maria Sharapova announced that she has failed a drug test due to a medicine she was taking.
CNBC's Eric Chemi reports Super Bowl champ Peyton Manning is rumored to announce his retirement, along with tennis star Maria Sharapova in a separate major announcement.
Major sports gambling website Pinnacle Sports suspended betting on Sunday.
Carlos Moya, once the world's top-ranked tennis player, shares his thoughts on the International Premier Tennis League (IPTL) and fellow Spaniard Rafael Nadal's chances at winning the 2016 ATP World Tour season.
Forbes Magazine recently compiled a list of the highest-paid athletes in 2015 to date, and CNBC has put together a list of the top five earners.
Rob Simmelkjaer, "Sports Matters" host, discusses the ratings boost from televising the U.S. Open.
Serena Williams was upset in the semifinal round by Roberta Vinci of Italy.
Brad Gilbert, ESPN tennis analyst, discusses the big business of tennis and Serena Williams' shot at the Grand Slam final.
Sixteen strangers from around the globe are stringing tennis rackets in a crowded room at the Billie Jean King Tennis Center in Flushing, New York.
More than 450 rackets are strung each day in the U.S. Open string room, where 16 workers service rackets for the likes Serena Williams and other stars.
U.S. Open ticket prices have skyrocketed this year, thanks in large part to Serena Williams' shot at the first grand slam sweep since 1988.
Tennis is supposed to be a young person's sport, but this year's U.S. Open could crown two of the oldest winners in its history.
Nike has long dominated the tennis wars with many of the biggest stars in the game, but Under Armour is betting big on its newest star.
The tennis player has already sold out two production runs of watches made in his honor.
The tennis players at this year's U.S. Open 2015 will play for a $3.3 million prize, but according to one ranking they probably don't need the money.
The U.S. Open Tennis Tournament kicks off today in New York.
DeflateGate investigator Ted Wells bought a Manhattan apartment owned by tennis stars Venus and Serena Williams for $2.1 million.
Novak Djokovic, Wimbledon tennis champion, discusses losing the final of the French Open a few weeks ago.