This week is the second anniversary of Giants outfielder Melky Cabrera winning the All-Star game trophy for Most Valuable Player. He's the only Giants player to win that award in the past 40 years.

You may notice, however, that the team is doing nothing to commemorate Cabrera's honor -- and the Giants tend to commemorate just about everything. This weekend, they held a beautiful ceremony to honor pitcher Dave Dravecky's cancer comeback game in 1989.

Cabrera should never expect one of those. One month after his big All-Star night, he was suspended 50 games by Major League Baseball for use of a banned substance. He never again wore a Giants uniform.

But guess what? That was just a small part of the story.

ST. PETERSBURG, FL - JULY 11:  Melky Cabrera #53 of the Toronto Blue Jays walks back to the dugout after striking out looking to end the top of the first
ST. PETERSBURG, FL - JULY 11: Melky Cabrera #53 of the Toronto Blue Jays walks back to the dugout after striking out looking to end the top of the first inning of a game against the Tampa Bay Rays on July 11, 2014 at Tropicana Field in St. Petersburg, Florida. (Photo by Brian Blanco/Getty Images) ( Brian Blanco )

According to a new book, before Cabrera's 2012 All-Star appearance, he had cut a deal with his performance-enhancing drug supplier. The deal went this way: If Cabrera won the game's MVP award, the supplier would receive a $5,000 cash bonus. But then Cabrera didn't pay the $5,000 -- which set in motion events that exposed the illegal South Florida PED operation called Biogenesis and subsequently brought down Yankees star Alex Rodriguez.

Sounds bizarre. But it's true. We know this because of Tim Elfrink and Gus Garcia-Roberts, who have written "Blood Sport -- Alex Rodriguez, Biogenesis, and the Quest to End Baseball's Steroid Era."

Elfrink's and Garcia-Roberts' dogged work over the past few years helped uncover the slimy truth about an "anti-aging" clinic in South Florida run by an ersatz doctor, Tony Bosch, who was providing testosterone and other PEDs to Rodriguez and other MLB players, including former A's pitcher Bartolo Colon and Cabrera.

The book covers the broader story. Cabrera, now with the Toronto Blue Jays, is basically only one chapter. But from the narrative, it's easy to conclude that if Cabrera had merely paid Bosch his $5,000 bonus (plus $9,000 more that Bosch said Cabrera owed), then the clinic might still be in business.

"Didn't know anything about that, no," said Giants manager Bruce Bochy after the weird story was explained to him the other day. "I just know that for part of that season, he was one of our best players."

Indeed, right up until the moment of Cabrera's suspension, he apparently had the Giants totally fooled -- as well as those fans at AT&T Park who dressed in "Melkmen" costumes. Cabrera was batting .346 with 11 home runs and 60 RBIs, with no one suspecting that the output might be artificially enhanced. But Cabrera, a friend of Rodriguez's, had met Bosch in Miami and embraced his "program."

Cabrera paid Bosch thousands of dollars per month for the PED tablets and creams. The doses were timed to avoid testing detection -- until Cabrera went off schedule. He was caught. Bosch, who lived a big-money lifestyle, wanted and needed Cabrera's money to stay solvent. After Cabrera wouldn't pay up, Bosch sought out a $4,000 loan from a Miami tanning bed proprietor.

Then, more sleaziness. Bosch reneged on the $4,000 loan. The angry tanning-bed guy seethed. He subsequently swiped some of Bosch's clinic paperwork and leaked it to the Miami New Times, an alternative weekly newspaper where Elfrink worked. Authorities and MLB soon got their hands on the information and made the link between Bosch and Rodriguez. This led to Rodriguez's current season-long suspension.

And we know what happened next to Cabrera. When his suspension was announced on Aug. 15, 2012, he left the Giants without cleaning out his locker or even addressing his teammates with an apology. Pundits opined that the Giants would fall out of contention without their top hitter. But the players seemed motivated to prove those pundits wrong and show Cabrera he wasn't needed (although Bochy rejects that analysis). The team went on to win the National League West and World Series.

Ever since, the Giants and Cabrera have been distant. Cabrera's suspension expired during the 2012 postseason, but he was told that his services weren't needed in the playoffs. On a trip to Toronto in 2013, the Giants staff brought the stuff he'd left behind at his locker. Later in the season when the Blue Jays played at AT&T Park, he was booed upon every plate appearance.

Bochy's only in-person contact with Cabrera occurred last season during that series in Toronto when Bochy presented Cabrera his 2012 World Series ring.

"It was just a short conversation," Bochy said, straining to recall the moment. "I did tell him he was a big part of our winning the division that year."

No doubt about that. He was also a big part of the Biogenesis scandal's unraveling, even if no one knew it at the time.

Contact Mark Purdy at mpurdy@mercurynews.com.