John Isner showed he has the big game to match his giant physique when he upset Gael Monfils of France 6-1 4-6 7-6 7-6 in the third round at the Australian Open.
The 2.06 metre tall American thumped 26 aces past a bewildered Monfils to lift his tally for the tournament to 81 but the world number 28 insists his booming serve is not his only asset.
The 24-year-old showed he also has the temperament as he rebounded from a sloppy second set to win two successive tiebreaks.
Isner's win over Monfils, ranked 12th in the world, was further proof of his growing status and enabled him to reach the fourth round of a grand slam for the second time.
Isner has started 2010 in great form.
He won last week's Auckland Open to capture his first ATP title and was promoted to the seedings for the Australian Open after Gilles Simon pulled out injured.