Williams prevails in Charleston
Serena Williams retained the Family Circle Cup after seeing off Jelena Jankovic in a fractious encounter in Charleston.
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The pair exchanged words across the net at the start of the second set and the verbals appeared to fire up Williams who upped her game to cruise to a 3-6 6-0 6-2 triumph.
Jankovic looked surprisingly comfortable in the first set as Williams failed to hit the sparkling heights she reached in her thrashing of sister Venus on Saturday.
But the complexion of the match changed following the spat in the first game of the second.
Serving at 40-15, Jankovic was halted midway through her delivery when Williams put up her hand to indicate she was not ready despite being in the customary crouch position.
The American told umpire Kader Nouni: "She's gotta wait for me," to which Jankovic responded: "How long do I have to wait?"
Williams said: "Until I'm ready. I don't play slow."
Jankovic indicated Williams was in position to receive but the world number one snapped: "Honestly, you got a problem. I'm not the one."
The incident is not the first time Williams has had issues with Jankovic, who is regarded as one of the fastest players on tour.
She held up her hand to slow down the Serbian in their last meeting, in Rome in 2010, and also had a word at the net after the match.
The exchange undoubtedly sparked Williams into life and she ran through the second set and, although the third was more competitive, the top seed had too much firepower for Jankovic, winning in one hour and 55 minutes.
Williams said afterwards: "I felt like I could have been up 3-0 (in the first set). She was playing really, really well, but it was just a shot here, a shot there, and she played really well in the big points. And I had so many opportunities that I missed.
"She took advantage of all of that, and she went on to glory in that first set. After that I just got really relaxed and was like, 'Serena, you have to chill out and not get crazy and if you win, great. If not, you're trying. She's playing really well. Just try and do the best you can.'"
Jankovic said she ran out of gas.
"In the third set I had some chances but I got tired," said the Serb. "It was my sixth match here and playing Serena is not easy. She's so strong. She's the number one player in the world for a reason. She was the better one at the end."