Number of medals: Mr. Phelps exceeded Mr. Spitz’s seven by one, with two more men’s swimming golds available. He matched Mr. Spitz’s mark of seven world records.
Head to head: In their six common events, Mr. Spitz won by an average margin of 1.58%, compared to just 0.67% for Mr. Phelps. Mr. Spitz set world records in all six, by an average margin of 0.93% compared to the pre-Olympic records. Mr. Phelps set new marks in five of the six, for an average margin 0.75% faster than the previous standard.
Across all their events, Mr. Spitz’s average winning margin was 1.47%, compared to 0.86% for Mr. Phelps. Mr. Phelps’s new records exceeded the old by 0.7%, compared to 0.87% for Mr. Spitz.