WEST PALM BEACH, Fla. -- Seemingly by the day, the top free agents from the 2019-20 class are being taken off the market as a flurry of extensions spread across Major League Baseball.

The extension craze has seen potential impending free agents such as Boston left-hander Chris Sale, Rockies third baseman Nolan Arenado, Cardinals first baseman Paul Goldschmidt, and Yankees outfielder Aaron Hicks, as well as Miles Mikolas of the Cardinals and Ryan Pressly of the Astros, all re-up with their current teams rather than head to the open market next winter. That leaves Nats third baseman Anthony Rendon as perhaps the biggest prize still set to become a free agent, unless the Nationals can secure a long-term deal.

Not much progress has been made between the Nationals and Rendon this spring, although general manager Mike Rizzo remains optimistic they will eventually reach a deal.

“There is still interest on both sides to get something done,” Rizzo said Saturday afternoon.

Rendon, who launched a solo homer in the third inning off Cardinals starter Mikolas in Saturday's 4-4 tie, has reiterated a few times in the past that he would be open to an extension to remain in D.C., and the Nats have expressed interest in keeping him in D.C. The Nationals extended an offer to Rendon earlier this spring, a source confirmed to MLB.com, but the offer was turned down. Exact terms of the offer remain unclear, but there still appears to be a significant gap between the two sides. News of the offer was first reported by NBC Sports Washington this week.

Rendon, 28, had been reportedly seeking a contract in the vicinity of the five-year, $151 million extension the Astros and second baseman Jose Altuve agreed to before the 2018 season, MLB Network Insider Ken Rosenthal reported this winter. But after Arenado, the other top third baseman who was set to reach the free-agent market, agreed to an eight-year, $260 million extension with the Rockies at the end of February, Rendon’s asking price has increased.

Even if the two sides do not reach a deal during Spring Training, they both are open to continuing talks during the regular season. Despite the cluster of recent extensions, Rizzo does not feel any added incentive to reach a deal with Rendon, reiterating the point that he does not allow the actions of other teams to influence his plan.

“I think there’s going to be a point where we think a fair and equitable deal is on the table, and they’ll come to the point where they think a deal is fair and equitable, and then you’ll get a deal done,” Rizzo said. “I don’t think that the perspective free-agent pool next year will affect us either way.”