Sara Errani of Italy serves to her compatriot Roberta Vinci during their women's singles quarterfinals match at the US Open tennis tournament in New York.

New York - Sara Errani beat her good friend and doubles partner Roberta Vinci 6-2, 6-4 on Wednesday to reach the semi-finals of the US Open for the first time.

The two Italians, who teamed up to make it to the doubles semi-finals at Flushing Meadows, briefly put their friendship aside as they traded blows for a place in the last four.

Errani was the favourite after making the French Open final this year and proved too strong for her countrywoman, landing an impressive 85 percent of her first serves to wrap up victory in 72 minutes.

Errani had never made it past the third round of the US Open before this year. She will play either Serena Williams or Ana Ivanovic in Friday's semi-finals. - Reuters