Unseeded Italian Flavia Pennetta stunned world No. 1 Jelena Jankovic Thursday 5-7, 6-3, 6-3 in the Zurich Open second round.
The Serb was playing her opening match of the week after receiving a first-round bye but showed little sign of having benefited from her brief rest since winning in Moscow.
"I had no gas left in the tank," Jankovic told reporters. "I am not a robot and after winning three titles in different time zones and climates I felt mentally and physically tired.
Jankovic took the first set with two breaks of serve against one dropped service game of her own but appeared to be unsettled by a painful-looking fall in the 12th game.
She received treatment for a cut on her knee after dropping serve again early in the second set only to fall further behind when Pennetta hit a return winner to go 4-1 up.
The Italian world number 17, who had lost all five of her previous meetings with Jankovic including last week's Moscow quarter-finals, kept her nerve to serve out the match as she finished off with an ace.
Source: Xinhua
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