Yzaga won 1985 junior tournament the French Open against the Austrian Thomas Muster, as well as on the side of Agustín Moreno the Junior Doubles of Wimbledon. In the same year he became a professional tennis player and was in Bahia, a tournament of the ATP Challenger Tour win. In addition, he settled in as a qualifier in the second round of the U.S. Open, where he lost to eventual champion Ivan Lendl.
In 1987, he won his first two ATP tournaments until 1993, he was able to win a total of eight ATP tournament wins, including Sydney International, Heineken Open, and the American Tennis Championships on clay in Houston. Its highest listing in the tennis world ranking he reached in 1989 with position 18 and position 54 in the single in a double. His best individual performance in a Grand Slam tournaments were reaching the quarterfinals at the Australian Open in 1991 and the U.S. Open in 1994, where he defeated the defending champion and world number one Pete Sampras among others.
Yzaga played 1984-1997 45 single and 23 double roles for the Peruvian Davis Cup team. Twice the team stood in the first round of the World Group. In 1989, she was defeated in spite of its two individual victories against Wally Masur and Jason Stoltenberg 2:3 against Australia. In 1994, she failed to 1:4 Denmark, the only victory won Yzaga while in singles match against Frederik Fetterlein.
In the years 1987 and 1988, respectively Yzaga won the Peruvian tennis championship in singles competition.
At the 1984 Summer Olympics in Los Angeles, he took up at the demonstration tournaments for players under the age of 21, but in which no medals were awarded. At the 1992 Summer Olympics, he retired in the second round against Pete Sampras.