Which player was a better tennis player with his non-dominant hand, Jürgen Melzer or Albert Costa?
Jürgen Melzer
Title: 2013 Wimbledon Championships – Men's Singles
Passage: Roger Federer was the defending champion but lost in the second round to World No. 116 Sergiy Stakhovsky in a huge upset.  Stakhovsky was unable to build on his effort and lost in the next round in 4 sets to Jürgen Melzer.  Federer's loss marked the first time since the 2004 French Open, when he lost to Gustavo Kuerten in the third round, that he had failed to reach at least the quarterfinals in a Grand Slam event.  It was also Federer's earliest exit in this tournament since 2002, and the first time that Federer lost to a player ranked lower than 100 since his loss to then World No. 101 Richard Gasquet at the 2005 Monte Carlo Masters.
Title: Jürgen Melzer
Passage: Jürgen Melzer (born 22 May 1981 in Vienna) is an Austrian tennis player.  He reached a career-high singles ranking of world No. 8 in April 2011, and a doubles ranking of world No. 6 in September 2010.  He is a left-handed tennis player, but is right-handed in everyday life.  He has a younger brother, Gerald Melzer, with whom he has played doubles in several tournaments.
Title: Albert Costa
Passage: Costa began playing tennis at the age of five.  He first came to the tennis world's attention as an outstanding junior player.  In 1993, he reached the French Open junior final and won the Orange Bowl.  He turned professional later that year and quickly established a reputation as a strong clay court player.  Spanish former player and commentator for Spanish television Andrés Gimeno used to call him "the man with two forehands", because he could hit with the same accuracy and strength both forehand and backhand.  In 1994, he won two challenger series events and was named the ATP's Newcomer of the Year.
Albert Costa Jürgen Melzer