He set his first mark in the 200-meter freestyle with a time of 2:07.12, surpassing Jim McConica time of 2:08.03.
“The entire experience was something that I’ll remember for a long time,” said Jack. “The swimmers and coaches were cheering me on knowing that I was attempting to break the record and that made all the difference in the swim.”Jack recorded his second world during the final day of competition - this time in the 100-meter freestyle with a time of 56.20 seconds, breaking the previous mark of 57.85 seconds held by Alexander Mills of Norway. His time also passed the United States Masters Swimming national record held by Paul Trevisan (58.07).
In addition, he finished five one-hundredths of a second shy of a third world record in the 50-meter freestyle with a time of 25.36 seconds. The current world record is held by Mike Tennant at 25.31 seconds.