Rubén Ramírez Hidalgo (born January 6, 1978 in Alicante, Spain) is a professional male tennis player from Spain. His career-high ATP entry ranking is #50 (achieved on 2 October 2006), and his current ranking is #84 (as of November 1, 2010). He turned pro in 1998.
At the 2006 French Open, Ramirez Hidalgo reached the 4th round in a Grand Slam event for the first time in his career. Before the tournament, he lost four consecutive times in the first round of a Grand Slam. At the 2008 Monte Carlo Masters, he was close to defeating world No.1 Roger Federer. Hidalgo lost the first set 1-6, but he went on to win the second 6-3. At the start of the third set, he quickly broke Federer twice and went 4-0 up. At that point, when playing the second point of the fifth game, Hidalgo attempted to embarrass the world No.1 by hitting a straightforward "hot-dog" shot to pass Federer, even though the court was well open for him just to hit a normal "winner". But ironically, that was the shot that supposedly self-destructed Hidalgo, when an angry but determined Federer went on to win 5 games in a row from being 5-1 down, then eventually took the set to a tiebreak and won it by 7 points to 1. The final score 6–1, 3–6, 7–6(1).