Madison Bumgarner is entering free agency at a curious time in his career. The longtime Giants ace has built a legendary reputation, but plenty of question marks also surround the 30-year-old.

Bumgarner proved he's still a workhorse after missing time the previous two seasons with freak injuries. His 34 starts were tied for the MLB lead, and his 207 2/3 innings pitched ranked second in the NL.

But while looking at Bumgarner's stats from this past season, one thing stands out that could hurt him in free agency and actually help the Giants if they want to bring back the left-hander.

MadBum's home-road splits were staggering in 2019. He was a completely different pitcher in front of the home crowd at Oracle Park, compared to pitching away from San Francisco.

Here are Bumgarner's home stats this past season, compared to when he pitched on the road.

Home: 19 GS, 6-2, 2.93 ERA, 122 2/3 IP, 40 ER, 15 HR, 120 SO, 21 BB, 0.93 WHIP, 5.71 SO/W

Away: 15 GS, 3-7, 5.29 ERA, 85 IP, 50 ER, 15 HR, 83 SO, 22 BB, 1.41 WHIP, 3.77 SO/W

Oracle Park is known as a pitcher's dream. In fact, the Giants' home park was the least favorable for offenses this season by Park Factors, per ESPN. The 11-year veteran used that his advantage, but that luxury didn't follow him on the road.

Bumgarner allowed the same amount of homers in four fewer road games as he did at home. He also walked one more batter and allowed five more hits -- 98 on the road, compared to 93 at home. For someone with a lot of mileage on his arm and his fastball declining in velocity, that's certainly alarming.

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As a pitcher who's never tested the open market and has spent his entire career in a pitcher's paradise, these numbers will be looked at closely by front offices around the league this offseason.

Bumgarner figures to join Gerrit Cole, among others, as the most coveted starting pitchers in free agency. So, while his road numbers could help the Giants in keeping him in San Francisco, they also could prevent the veteran from signing the hefty contract he likely desires.