San Francisco Giants reliever Guillermo Mota was suspended for 100 games on Monday, becoming the third major-league player penalized twice for positive drug tests.

The commissioner's office said the 38-year-old righthander tested positive for Clenbuterol. Mota also was suspended for the first 50 games of the 2007 season while with the Mets.

The Players Association filed a grievance challenging the suspension. An arbitrator will hear the grievance.

Outfielder Manny Ramirez and catcher Eliezer Alfonzo are the only previous players to twice test positive.

No player ever has tested positive three times, which earns a lifetime ban.

Clemens trial goes on

A short clip from Mike Wallace's 60 Minutes interview with Roger Clemens in 2008 provided just enough ambiguity for the judge to rule it out, hurting the government's hopes of proving one piece of its case against the 11-time all-star pitcher.

Lawyers for Clemens also entered their reasons to strike testimony from former teammate Andy Pettitte.

The trial focuses on whether Clemens lied to Congress in 2008 when he said he had never used human-growth hormone and steroids.

A trial last year ended in a mistrial.

Grant to foundation

The New York Life Foundation announced a $1 million grant over three years to the Moyer Foundation, set up by pitcher Jamie Moyer to provide education and support to children in distress, at free camps across the United States and Canada.

Streaking

Matt Kemp entered Sunday's Dodgers-Cubs in the seventh inning as a pinch-hitter, keeping alive his consecutive games streak at 392.

Noteworthy

The Angels placed righthander LaTroy Hawkins on the 15-day disabled list because of a broken pinkie finger on his right hand.

Brewers shortstop Alex Gonzalez has a torn ligament in his right knee and will have season-ending surgery,

Yankees closer Mariano Rivera was examined by three doctors at two hospitals as he determines where he will have knee surgery.

New York general manager Brian Cashman said Rivera was seen by physicians at New York Presbyterian Hospital and the Hospital for Special Surgery.

The 42-year-old tore the anterior cruciate ligament in his right knee Thursday.

Contact Don McKee at dmckee@phillynews.com.

This article contains information from the Associated Press.