He turned pro at age 17. His doubles record at the Association of Tennis Professionals/Women's Tennis Association Tour and International Tennis Federation Pro Circuit main draw is 187 wins and 105 losses. In the International Tennis Federation Pro Circuit main draw Guidolin’s career singles record is 160 wins versus 121 losses.
Career doubles in the International Tennis Federation Pro Circuit main draw was 159 wins to 82 losses.
In 2009 he won two Challenger level Association of Tennis Professionals doubles titles with partner Marcelo Demoliner. Guidolin’s career high singles ranking was reached on May 16, 2011, attaining the rank of 340. His career high rank for doubles is 167, which he achieved on March 1, 2010. Guidolin’s career win-loss record at the Association of Tennis Professionals/Women's Tennis Association Tour and International Tennis Federation Pro Circuit main draw is 166 wins and 132 losses.
