(CNN) -- Fourth seed Novak Djokovic is through to the second round of the men's singles at Roland Garros, after opponent Nicolas Lapentti was forced to retire with a left ankle injury.
Lapentti gets treatment for his ankle injury prior to quitting his first round match against Novak Djokovic.
The Serb, a semifinalist here for the last two years, was leading 6-3 3-1 when the Ecuadorian had to call it a day.
Djokovic has enjoyed an impressive clay-court season with a win in Belgrade as well as runner-up spots in Monte Carlo and Rome.
The 22-year-old also pushed world number one Rafael Nadal all the way in a marathon four-hour semifinal in Madrid, where he had three match points before the Spaniard prevailed.
"The conditions were tough. The wind was powerful and it was hard to judge which side the wind was coming from," Djokovic told reporters.
Elsewhere, Argentine fifth seed Juan Martin Del Potro cruised past France's Michael Llodra 6-3 6-3 6-1, while there were also victories for ninth seed Jo-Wilfried Tsonga, 11th seed Gael Monfils and 16th seed Tommy Robredo.
However, there was a surprise when American 15th seed James Blake was humbled 7-6 7-5 6-2 by Argentine qualifier Leonardo Mayer.
Blake's compatriot Mardy Fish, the 22nd seed, also fell to an Argentine with Maximo Gonzalez securing a 6-3 1-6 6-4 7-6 win, while 27th-seeded German Rainer Schuttler suffered a crushing 6-0 6-0 6-4 defeat at the hands of Marc Gicquel of France.