Former champion Stan Wawrinka brushed aside Andy Murray 6-1, 6-3, 6-2 in the marquee match-up on the opening day while Italian teenager Jannik Sinner demolished Belgian 11th seed David Goffin 7-5, 6-0, 6-3 in the first round of the French Open on Sunday.
Wawrinka, the 16th seed who took the title in 2015, had also come out on top when the two last met in Paris in a five-set semi-final in 2017.
Murray, who needed a wild card to play in Paris this year, was competing in a clay court tournament for the first time since that clash.
Wawrinka fired 42 winners past the former world number one and will take on Dominik Koepfer of Germany for a place in the last 32.
Murray, now ranked at 111 in the world after being pushed to the brink of retirement by his lengthy battle with a hip injury said: “I should be analysing that hard and trying to understand why the performance was like…