The 29-year-old ran a T44 200 metres world record with a time of 22.47sec yesterday, before taking to the track again todayto smash his own 400m world record, running the first sub-50 second time in the event.

Prince, the Paralympic bronze medallist in the event, held the previous record which stood at 50.61, but the American managed a 49.87 second run in Texas to set a world best.

"I just went out and ran really hard," he said.

"That is what my coach told me to do so that is what I did.

"Training has kind of helped with giving me a good understanding of pace and how I need to run the cycle of the race.

"Having a good racing plan, going out and having a good race that is what my coach wanted me to do and that is what I did."

Quadruple Paralympic Champion Raymond Martin won the men's T51/52 1500m in San Antonio

"Nothing has really changed." Prince said of how the two world records would affect his preparations for next month's International Paralympic Committee (IPC) World Championships in Lyon.

"I might have my name up on a board or something but nothing's really changed."

Quadruple gold medallist at London 2012 Raymond Martin won the men's T51/52 1500m with a time of 4:14.60, ahead of Steven Toyoji and Isaiah Rigo, and Josh George took the men's T54 400m and the 1500m events.

The US Paralympics squad for the 2013 IPC World Championships in Lyon  is due to be announced on Tuesday (June 18).

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