The Mariners are looking for big things from Yuniesky Betancourt, judging by the contract extension they just gave him. Seattle's slick fielding shortstop, with an emerging bat, is to earn $13.75 million under a four-year extension the team announced on Wednesday. Betancourt, who fled Cuba in December 2003 by boat, is making just $400,000 this year and had been set to earn $990,000 in 2008. The third-year player will receive a $1.5 million signing bonus under the new deal and will make $1.25 million in 2008, $2 million in 2009, $3 million in 2010 and $4 million in 2011. The club option in Betancourt's potential free-agency year of 2012 is $6 million with a $2 million buyout.