Andy Murray faces Croat Ivo Karlovic in the French Open third round on Friday after surviving five-set scares in his first two matches in Paris.
Davis Cup captain Leon Smith says Murray's good form before Roland Garros may be behind his initial struggles.
Murray's meeting with big-serving veteran Karlovic is the second match on Court Suzanne Lenglen on Friday.
The British number one warmed up for the French Open by beating world number one Novak Djokovic in straight sets in the final of the Italian Open.