Oswalt was optioned to Triple-A Las Vegas on Tuesday, Tim Healey of Newsday reports.

Oswalt was with the major-league club for four games, but he failed to make an appearance. The 24-year-old has 20 strikeouts and seven walks in 17.2 innings at Triple-A this year, and he should be one of the top options the next time the Mets are in need of a spot starter.

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