"The Nationals, Marlins and Rangers are the most aggressive teams on free-agent left-hander Mark Buehrle, according to major-league sources.

All three clubs also are pursuing free-agent lefty C.J. Wilson, but the Nats would prefer Buehrle on a shorter deal to Wilson on a longer one, sources said.

The Rangers, meanwhile, are wary of overpaying Wilson, who also is drawing interest from their biggest rival, the Angels."