French Open 2015: Wawrinka Beats Tsonga to Advance to Final

Photo Stan Wawrinka served 15 aces and hit 60 winners to progress to his second final at a Grand Slam tournament. Credit Etienne Laurent/European Pressphoto Agency PARIS — A first-round loser at the French Open last year, Stan Wawrinka is into the final this year.

“It’s difficult to keep a cool head every week,” Wawrinka said of that contrast. “That’s the big difference with the Big Four.”

Clearly, the Big Four – Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray – have set a new standard for oligarchical rule in men’s tennis.

But Wawrinka, who won the 2014 Australian Open, is turning into quite a spoiler, and his grinding 6-3, 6-7 (1), 7-6 (3), 6-4 victory over Jo-Wilfried Tsonga of…