Former San Francisco 49ers QB Colin Kaepernick adds tennis superstar Serena Williams to the 10 for 10 challenge that will wrap up the QB's pledge to donate a million dollars to charities around the nation.

Kaepernick has donated a million dollars to 30 different charities including notable organizations like Mothers Against Police Brutality to the I Will Not Die Young Campaign while facing extreme backlash from critics. His final $100,000 will be divided among 10 organizations to cap off his pledge. 

In the last five days, Kaepernick has partnered up with Golden State Warriors stars Kevin Durant and Steph Curry, rap legend Snoop Dogg and now Williams. Each has named a charity that will receive the $10,000 from Kaep and the celebs that come aboard will match his donation.

Curry and Durant will donate 10k to the Silicon Valley De-Bug, a community organization in San Jose and Northern California's South Bay that benefits youth, immigrants and low-wage workers. 

Snoop will donate to Mothers Against Police Brutality and has decided to sweeten the deal by donating an additional $15,000 on top of the $10,000 he originally pledged.

Via Twitter, Kaep announced that Williams reached out to him and asked that he donate to Imagine LA.

The organization has been instrumental in curbing homeliness in the city. He will donate 10k and Williams, of course, will match it. 

Keep fighting the good fight Kaep! 

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