David Robertson to Phillies; Zach Britton to Yankees, Craig Kimbrel to Red Sox Next?

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MLB's free-agent bullpen market is taking shape.

The Philadelphia Phillies signed right-handed relief pitcher David Robertson on Thursday to a two-year deal worth at least $23 million. Robertson will earn $10 million in 2019 and $11 million in 2020, with a $12 million club option (or a $2 million buyout) for 2021.

Robertson, 33, went 8-3 last season for the New York Yankees with a 3.23 ERA and with a 3.50 strikeout/walk ratio in 69.2 innings.

"Philly really checked off all the boxes for me," Robertson said, per MLB.com. "They are hungry to get back to the postseason and win. They have a great fan base, a beautiful ballpark and a special focus on charity. They've put together a great squad, and I think I can bring a lot to the team in the back end of their bullpen."

The Yankees responded by turning their focus toward Zach Britton, according to WFAN's Jon Heyman, though the lefty has multiple offers on the table.

Britton, the 31-year-old former All-Star whom the Yankees acquired from the Baltimore Orioles prior to the 2018 trade deadline, finished last season with a 3.10 ERA and 1.23 WHIP in 40.2 innings.

And the Boston Red Sox appeared one step closer to a reunion with closer Craig Kimbrel after the Phillies, possibly the most logical challenger for Kimbrel's services, agreed to the deal with Robertson.

Kimbrel, 30, recorded 42 saves (and six more during the postseason run to a World Series title) in 2018, though he wasn't at his dominant peak. The Atlanta Braves -- Kimbrel's original team -- remain a contender, and the Los Angeles Angels and St. Louis Cardinals could be lurking.

Adam Ottavino, lately of the Colorado Rockies, is another high-end reliever who remains unsigned.

With 94 WIP, WFAN.com and WEEI.com