Italy's Sara Errani won through at the Sydney International in a matchup against compatriot Roberta Vinci on Sunday, as American teen Madison Keys pulled off an upset win over Simona Halep.

Errani, the third seed and world No.7, said it had been tough playing in the heat in her first-round match against Vinci, her doubles partner, with the first set taking 40 minutes.

Earlier, rising American star Keys bundled seventh seed Halep out of the tournament 6-1, 6-4 to progress to the second round, where she will face wild card Ajla Tomljanovic who beat Daniela Hantuchova in straight sets.

Keys made the quarterfinals of the tournament as a 17-year-old a year ago before she fell to China's Li Na in three sets.

Agencies - Global Times