The phrase "as he competed" is correct and usable in written English.
It can be used to describe actions or events occurring simultaneously with someone competing in a contest or event.
Example: "As he competed in the marathon, he felt a surge of adrenaline pushing him forward."
Alternatives: "while he was competing" or "during his competition."
The Italians played with great vigour and Boateng's handball as he competed with Giorgio Chiellini gave Bonucci the chance to equalise from the penalty spot.
Harry kept his distance as he competed with his fierce rival, the late James Whitaker, to report on the troubled relationship between Prince Charles and Princess Diana.
Instead, the 22-year-old Johnson was there to cheer on her younger brother, Anders Johnson, a member of the men's team, as he competed in the qualification round on the large hill.
Not afraid to relocate winger to stand, he trained as he competed, and as such was banned from marking Best, even though the two were part of the same social group that also included Sadler, Jimmy Ryan and John Fitzpatrick.
There was a hint of a romantic concession to the occasion in referee Michael Oliver's determination to punish Ashley Westwood's flailing arm as he competed for a header with Matt Bloomfield.
As he competed against some of the best riders in the world on the Southern California circuit, his opportunities, at least when it came to getting on good horses, were close to nonexistent.
One campaign challenge will be keeping Mr. Romney in the spotlight, particularly as he competes with the White House for attention.
In short, his résumé is campaign gold as he competes in one of the closest House races this year.
Aliaksandr Faminou, of Belarus, rides his horse Coolroy Piter as he competes in the equestrian eventing cross-country stage.
Photograph: Hannah Johnston/Getty 1.47pm BST Senegal's Malick Fall looks dramatic as he competes in the men's 100m breaststroke.
Photograph: Marko Djurica/ Reuters 11.28am BST Andres Mata Perez takes the strain as he competes in the men's 77kg weightlifting competition.
