Tennis is a racquet sport that can be played individually or as doubles teams. Players use racquets to hit a hollow rubber ball over a net and into the opponent's court. The objective is to prevent the opponent from returning the ball. The rules have changed little since the 1890s. Tennis originated in 12th century France and was popularized by Louis X of France in the 13th century. Major professional tennis tournaments include Grand Slams, ATP/WTA tours, Challenger, and Futures events. The top male and female players in Grand Slam titles are Roger Federer, Rafael Nadal, Pete Sampras, and Serena Williams.