Defending champion Juan Carlos Ferrero defeated Guillermo Coria in the final, 6–2, 6–2 to win the singles tennis title at the 2003 Monte Carlo Masters.
This was a breakthrough tournament for future eleven-time champion Rafael Nadal. With his second round victory over defending French Open champion Albert Costa, he entered the world's Top 100 in the ATP rankings for the first time. He lost to Coria in the third round, which would remain his sole loss at the tournament until 2013.[1][2]
^Nadal has won an all-time record 11 titles at the Monte Carlo Masters, including an Open Era record streak of eight consecutive titles from 2005 to 2012 and three consecutive titles from 2016 to 2018.