File this one away for July.

Felix Hernandez has a 10-team no-trade clause in his contract with the Seattle Mariners. During this season, the right-hander will be able to block deals to the New York Yankees, New York Mets, Boston Red Sox, Chicago Cubs, Los Angeles Angels, Los Angeles Dodgers, Texas Rangers, Philadelphia Phillies and two unknown teams, a major league source said.

We shouldn’t infer from that list that Hernandez wants to avoid large-market clubs. Rather, astute players (and agents) will often protect against trades to high-revenue teams, because those clubs (a) are most likely to be interested in acquiring expensive players and (b) have the wherewithal to offer financial inducements that encourage players to waive the clauses.

Mariners general manager Jack Zduriencik has said Hernandez isn’t available on the trade market. But some in the industry believe that could change if the Mariners start slowly for a second straight year.

Hernandez signed a five-year, $78 million contract extension prior to last season. The deal is actually richer than that, since Hernandez’s 2011 salary jumped from $10 million to $11 million after he won the Cy Young Award last season.

— Jon Paul Morosi