Tsonga was broken in the very first game but continued to go for his shots and he broke back to level at 2-2 with a rasping cross-court forehand.

From then on the first set went with serve and into a tie-break, where Tsonga's errors proved far more costly.

Del Potro clinched the set with a big serve of his own and started the second set in confident fashion, breaking to lead 2-0.

Tsonga quickly fought back again to level and also kept his hopes alive when he trailed 15-30 at 4-5 with a slam-dunk smash and equally athletic volley that helped him hold.

The Frenchman's impressive performance was captivating, and the atmosphere reached fever pitch as the entranced crowd burst into applause.

But Del Potro again seized control of the second-set tie-break with a run of four straight points, capped by a rasping forehand winner on the run, and he sealed his victory with an overhead.

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