Serena Williams

CINCINNATI, August 15: World number one Serena Williams powered into the semi-finals of the US Open tune-up at Cincinnati on Friday with a 6-1, 6-3 win over Jelena Jankovic. Williams, who fell to elder sister Venus in the semi-finals at Montreal last week, needed just 58 minutes to subdue the eighth-seeded Jankovic.

She’ll face either fourth-seeded Agnieszka Radwanska of Poland or former world number one Caroline Wozniacki of Denmark for a place in the final.

France’s Julien Benneteau won 12 of the last 15 games to stun Australian Open champion Stan Wawrinka 1-6, 6-1, 6-2 in Cincinnati on Friday and reach the first Masters semi-final of his career. Benneteau, ranked 41st in the world, fired nine aces and broke the third-seeded Swiss four times in the 80-minute contest.

After sweeping through the first set in 27 minutes, Wawrinka could find no answer. Benneteau broke for a 2-0 lead in the second set and rolled from there. He finished off the victory with an ace on the first of two match points.

Benneteau next faces either sixth-seeded David Ferrer or fellow Spaniard Tommy Robredo — who dispatched world number one Novak Djokovic in the third round.

Benneteau is making his ninth appearance in Cincinnati, a key tune-up event for the US Open, the final Grand Slam of the year that starts on August 25. His previous best showing was a quarter-final in 2009.

He now stands 14-43 against top 10 opponents and 2-2 this season against the elite after beating Toronto Masters champion Jo-Wilfried Tsonga en route to the quarter-finals at Indian Wells.