SAN DIEGO — Sometimes, for his annual news conference at baseball’s winter meetings, Scott Boras stands before a Christmas tree in the host hotel’s lobby. This year, he opted for a silver-canvas backdrop emblazoned with dozens of logos for his agency. As reporters fanned out before him on Tuesday, in a semicircle 10 people deep, it was hard to miss the symbolism: The sport’s most powerful agent was planting a flag — almost literally — and making these meetings his own.

By Wednesday night, Boras had reached agreements on three contracts — one for each full day of the meetings — worth $814 million. Stephen Strasburg signed a seven-year, $245 million deal with the Washington Nationals on Monday. Gerrit Cole agreed to a nine-year, $324 million contract with the Yankees on Tuesday. Then came Anthony Rendon’s seven-year, $245 million agreement with the Los Angeles Angels on Wednesday.

Boras is well-known — some would say notorious — for his patience, often waiting until January or February to find the right market conditions for his clients. This time, wealthy teams were eager to court Strasburg, Cole and Rendon, and wasted no time.

“It’s a supply and demand thing every year, and the supply of these elite guys was small and the demand was high,” Nationals General Manager Mike Rizzo said. “If you wanted to get one of them, I think everyone thought you had to jump in and get moving. I don’t think anybody thought this was going to last into the New Year.”