In all, Fittipaldi won five races and scored 61 points, winning the championship, while Walker never finished a Grand Prix higher than ninth place (in Spain), his best race where he had been contesting 5th place with Peter Revson, when he ran out of fuel, in the last laps. He was promising in the opening laps at Monaco where he had F3 experience, but made mistakes in the extraordinary downpour. By mid season Team Lotus was totally focused on Fittipaldi taking the Championship, and Walker's 72 was of little importance, but predictably his form at Brands and in Austria suggested some improvement, while the engine lasted. Lotus blamed Walker's allegedly inadequate driving technique, poor fitness and lack of mechanical sensitivity; while Walker claimed Lotus gave him inferior equipment and gave far more attention to Fittipaldi's needs than his. He was not retained for the 1973 season, and was replaced by Ronnie Peterson. David Walker remains the only driver not to score a single Formula One Championship point in the same season his teammate won the drivers' title.