Robert Larimore Riggs (February 25, 1918 - October 25, 1995) was an American tennis champion who was the World No. 1 or the World co-No. 1 player for three years, first as an amateur in 1939, then as a professional in 1946 and 1947. He played his first professional tennis match on December 26, 1941. As a 21-year-old amateur in 1939, Riggs won Wimbledon, the U.S. National Championships (now U.S. Open), and was runner-up at the French Championships. He was U.S. champion again in 1941, after a runner-up finish the year before.

Small in stature, he lacked the overall power of his larger competitors such as Don Budge and Kramer but made up for it with brains, ball control, and speed. A master court strategist and tactician, he worked his opponent out of position and scored points with the game's best drop shot and lob as well as punishing ground strokes that let him come to the net for put-away shots. Kramer, one of the very few players who was undeniably better than Riggs, writes that there is a major "misconception" about Riggs. "He didn't play some rinky-dink Harold Solomon style, pitty-pattying the ball around on dirt. He didn't have the big serve, but he made up for it with some sneaky first serves and as fine a second serve as I had seen at that time. When you talk about depth and accuracy both, Riggs' second serve ranks with the other three best that I ever saw: von Cramm's, Gonzales's, and Newcombe's." In his autobiography, Riggs wrote, "In the 1946 match with Budge [for the United States Pro Championship], I charged the net at every opportunity. Employing what I called my secret weapon, a hard first serve, I attacked constantly during my 6-3, 6-1, 6-1 victory."  "Riggs," said Kramer, "was a great champion. He beat Segura. He beat Budge when Don was just a little bit past his peak. On a long tour, as up and down as Vines was, I'm not so sure that Riggs wouldn't have played Elly very close. I'm sure he would have beaten Gonzales -- Bobby was too quick, he had too much control for Pancho -- and Laver and Rosewall and Hoad."  Kramer went on to say that Riggs "could keep the ball in play, and he could find ways to control the bigger, more powerful opponent. He could pin you back by hitting long, down the lines, and then he'd run you ragged with chips and drop shots. He was outstanding with a volley from either side, and he could lob as well as any man.... he could also lob on the run. He could disguise it, and he could hit winning overheads. They weren't powerful, but they were always on target."

Did Riggs play in tournements?