Becoming a chair umpire at top events takes years of officiating lower-tier matches, attending seminars, passing written tests and undergoing evaluation after evaluation--plus some luck.

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The loss of that game prompted the 25-year-old to slam his racket against his chair, for which he was warned by the umpire.

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The chair umpire at the U.S. Open has the best seat in the house--especially if there's yet another epic Rafael Nadal-Roger Federer final.

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An unforced error made it 5-3 before the Serb thought she had aced on the next point, but the chair umpire ruled that Williams, who had her hand up, had called for Jankovic to delay her serve.

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