Murray a worry for defending champ Wawrinka

French Open champion Stan Wawrinka on Wednesday hailed Roland Garros semifinal opponent Andy Murray as playing at a higher level, despite both men having captured two Grand Slam titles each.

The pair meet on Friday for a place in the final, with the 31-year-old Swiss trying to stay on track to defend the title he won 12 months ago in a huge win over Novak Djokovic.

Murray is bidding to be the first British man in the Paris final since Bunny Austin in 1937.