Tyler Lanier Walker is a Major League Baseball

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 relief pitcher

Relief pitcher

A relief pitcher or reliever is a baseball or softball pitcher who enters the game after the starting pitcher is removed due to injury, ineffectiveness, fatigue, ejection, or for other strategic reasons, such as being substituted by a pinch hitter...

 who is currently pitching for the LongIsland Ducks Of The Atlantic League. He is an alumnus of San Francisco University High School

San Francisco University High School

San Francisco University High School is an academically focused, college preparatory, private high school located in the Pacific Heights neighborhood of San Francisco, California...

 and University of California, Berkeley

University of California, Berkeley

The University of California, Berkeley , is a teaching and research university established in 1868 and located in Berkeley, California, USA...

. Walker has pitched for the New York Mets

New York Mets

The New York Mets are a professional baseball team based in the borough of Queens in New York City, New York. They belong to Major League Baseball's National League East Division. One of baseball's first expansion teams, the Mets were founded in 1962 to replace New York's departed National League...

 , San Francisco Giants

San Francisco Giants

The San Francisco Giants are a Major League Baseball team based in San Francisco, California, playing in the National League West Division....

 (-, -), Tampa Bay Devil Rays

Tampa Bay Rays

The Tampa Bay Rays are a Major League Baseball team based in St. Petersburg, Florida. The Rays are a member of the Eastern Division of MLB's American League. Since their inception in , the club has played at Tropicana Field...

 (2006), Philadelphia Phillies

Philadelphia Phillies

The Philadelphia Phillies are a Major League Baseball team. They are the oldest continuous, one-name, one-city franchise in all of professional American sports, dating to 1883. The Phillies are a member of the Eastern Division of Major League Baseball's National League...

 (2009) and Washington Nationals

Washington Nationals

The Washington Nationals are a professional baseball team based in Washington, D.C. The Nationals are a member of the Eastern Division of the National League of Major League Baseball . The team moved into the newly built Nationals Park in 2008, after playing their first three seasons in RFK Stadium...

 (2010).
Walker's big break came in , when Giants' closer

Closer (baseball)

In baseball, a closing pitcher, more frequently referred to as a closer , is a relief pitcher who specializes in closing out games, i.e., getting the final outs in a close game. Closers often appear when the score is close, and the role is often assigned to a team's best reliever. A small number of...

 Armando Benítez

Armando Benítez

Armando Germán Benítez is a relief pitcher who is currently a free agent.-Baltimore Orioles:...

 was out of action for three months. With only one major league save in his career to that point, Walker filled in admirably by converting 23 out of 28 save opportunities.