If he does it again, he forfeits a first serve and must hit a second serve.
Robson was able to stay with Jankovic when she made her first serve, but a statistic of just 14% of points won on her second serve held the key to the opening set.
But the turning point proved to be the first time Baltacha lost her serve in the second set.
The American then found some of her old energy and enthusiasm, first easily holding serve before wrapping up the second set with a delighted scream.
The first two games of the second set went with serve but Wilkstrom was broken in the third game and Houdet and Jeremiasz rattled off the next four games to claim the 7-6 6-1 win.
He was convincing and often dominant against the rangy 25-year-old Frenchman, roaring to a 5-1 lead in taking the first set, feasting on Monfils's second serve, and fending off multiple set points before winning the tiebreak.
Murray, whose service game was impeccable, held to clinch the first set and both players held serve in the second for a nail-biting tie-break.
It was an issue that the Londoner managed to address in the second with three impressive holds as her first serve really began to fire, and it got out her out of trouble on three break points in game eight.
Clijsters raced to a 5-1 lead, helped by her first ace of the match -- coming off a second serve -- but then missed three match-point chances at 6-3.
Srichaphan, who has slipped to number 57 in the world after a highest ranking of nine two years ago, continued to hold serve comfortably in the first half of the second set.
The eighth seed was grateful to edge a tight first set and her erratic serve did not improve in the second either.
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She broke Vaidisova twice to quickly wrap up the first set and early in the second set, the Czech lost her serve again and from then on Petrova dominated.
Baltacha used her physical presence to force her opponent into making errors, as she broke her serve for a second time in the seventh game before securing the first set.
Baker, who returned to the tour last year after missing almost six seasons with a variety of injuries, won a first-set tiebreaker and was level at 1-1 on serve in the second.
Williams, 27, broke serve in the sixth and eighth games of the first set and the second set was one-way traffic as the champion won 10 games in a row to march through in just 64 minutes.
His dominance in the first set was awesome, with the Argentine a poor second best when it came to second serve returns, primarily because of Murray's fantastic power and precision from the baseline.
Ward began to show nerves in the fourth game of the second set, when he was taken to deuce on his serve for the first time, and two service games later, the pressure got to him.
He is thinking about his customers first, his future employees second, and is ensuring that he creates a company culture that will serve his employees and his customers well.
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Second, Mr Vajpayee wants his place in history as the first non-Congress prime minister to serve a full five-year term.
Li, who also was chasing a second major title, found herself in early control of the first set, which alone included seven breaks of serve.
Ms. Li, who also was chasing a second major title, found herself in early control of the first set, which alone included seven breaks of serve.
He returned to NASA twice to serve on boards of enquiry, the first into the near-disaster of Apollo 13, the second into the disintegration of the space shuttle Challenger in 1986.
The unseeded Sugiyama went 3-0 down in the first set but won the next nine games, before Hantuchova held serve to make it 3-1 in the second set.
But one break of serve saw a nervy-looking Murray concede the first set and, although he hit back in the second, three break points went begging in game one of the third set, which Roddick went on to take on a tie-break.
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