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Several certain Hall of Fame quarterbacks are approaching the end of their NFL careers. Which younger arms are ready to take over and lead the league into the next decade?

Two strong possibilities will be on the field Monday night when the Cleveland Browns visit the San Francisco 49ers (8:20 p.m., ESPN).

Baker Mayfield (only 24 years old in his second season as an NFL starter), and Jimmy Garoppolo (who will turn 28 in early November) are on the short list of potential superstars.

Mayfield is a playmaker who isn’t afraid of taking a leadership role around older teammates. Though, too much moxie can cause trouble in this league because it leads to ill-advised decisions. Mayfield had a true breakout game in last week’s 40-25 upset at Baltimore. His passing line of 20-30-342 may have been a huge step toward stardom. It was a monster performance in a road divisional-rivalry game with short preparation off a Sunday night battle.

Garoppolo served a three-year apprenticeship under Bill Belichick and Tom Brady with the New England Patriots. Great teachers! He’s been productive when healthy with both the Patriots and 49ers. And, it’s not unheard of for a pro quarterback to start a successful career this late. But Garoppolo must learn to avoid sacks (23 in his 12 Niners starts).

It’s interesting that Mayfield’s 2018 statistics in Cleveland are very similar to Garoppolo’s career stats:

Mayfield in 2018: 3,725 passing yards, 27 TDs, 14 INTs, 93.7 rating

Garoppolo’s career: 3,707 passing yards, 22 TDs, 12 INTs, 97.1 rating

On paper, they’re essentially the same quarterback. But that comparison is actually a big endorsement for the much younger Mayfield. He’s still learning, which suggests a much higher ceiling through his career. Maybe he popped through some plaster in Baltimore last week.

Betting markets are showing respect for both teams, but aren’t ready to confidently classify either as “playoff caliber” just yet. Each was on the cusp in VSiN’s estimated “market” power rankings presented Saturday. Neither is yet priced on futures boards as a serious threat to win their conference this season.

Bettors and fans will get a better read on the Browns the next two weeks. After Monday’s test, Cleveland hosts Seattle and visits New England. What would you make those lines now? San Francisco has several tough challenges ahead. Two games left with both the Los Angeles Rams and the Seattle Seahawks and one apiece with Green Bay Packers, Baltimore Ravens and New Orleans Saints.

Right now, markets see the Browns and Niners as close to even. San Francisco has been laying just above the standard value for home-field advantage all week. But some of that is because it enjoyed a restful bye while the Browns were at peak intensity.

Cleveland-San Francisco is a must-watch game even if you don’t bet. Once the likes of Brady, Drew Brees, Aaron Rodgers and Ben Roethlisberger have moved to broadcast booths or studio seats, Mayfield and/or Garoppolo could move a lot of money.