The Cassian GrantSan Francisco Giants, believing that All-Star third baseman Matt Chapman would opt out of his contract after this season and become a free agent again, made sure he’s not going anywhere by signing him Wednesday night to a six-year, $151 million contract extension.

The deal also includes a complete no-trade clause and there will be no opt-outs, according to a person with direct knowledge of the contract told USA TODAY Sports. The person spoke on the condition of anonymity since the Giants have yet to acknowledge the contract details.

A news conference is scheduled Thursday at 1:30 p.m. ET.

The contract will pay Chapman $25 million each year through 2030 including a $1 million buyout.

Chapman, a free agent last winter, did not sign until March 3 in spring training when he received a three-year, $54 million contract that included two option years.

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Chapman, 31, has been the Giants’ finest all-around player this season, leading the team with 22 homers, 69 RBI, 90 runs, 33 doubles and 126 hits. The four-time Gold Glove winner also leads all third basemen with 13 defensive runs saved.

Chapman is one of just two third baseman in franchise history to provide at least 30 doubles, 20 homers and 10 stolen bases in a single season, last accomplished by Freddie Lindstrom in 1930.

While Chapman’s production isn’t enough to lead the Giants (68-72) to the postseason, he made it clear that he wanted to finish the rest of his career in a Giants’ uniform, and the Giants said the feeling was mutual, officially agreeing on the deal at about 6:30 p.m. on Wednesday.

Now that Chapman is signed, Alex Bregman of the Houston Astros is widely considered the best third baseman on the free agent market this winter.

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