EXCLUSIVE: David Ross Opens Up About His Emotional Night on 'DWTS': 'You're Going to Make Me Cry Again!'

Plus, hear why the former MLB star says he 'can't repay' his pro partner, Lindsay Arnold.

David Ross has officially made it into the season 24 semi-finals of Dancing With the Stars!

The former MLB pro advanced to the next round of the dance competition show on Monday night, along with Normani Kordei, Rashad Jennings and Simone Biles. Backstage, Ross told ET he never would have been able to make it this far without his pro partner, Lindsay Arnold.

WATCH: Lindsay Arnold Opens Up About Her 'Toot Heard Around the World' on 'DWTS'

"I can't repay her," he gushed to ET's Nischelle Turner.

In addition to their trio dance, the father/daughter-like duo danced a gorgeous waltz to Tim McGraw's "Humble and Kind," marking the pair's most emotional ballroom routine yet. They received a score of 36/40 from the judges, with Len Goodman saying it was "100 percent" Ross' "best dance."

"Listen, I'm glad they only had a minute and half of [that] clip because I was crying for at least 20, no doubt," Ross, 40, said of his pre-taped interview package, which showed him getting a little teary-eyed. "You're going to make me cry again."

"When someone you've known for two and a half months picks out a song like 'Humble and Kind' -- I'm a country music fan and Tim McGraw -- and sees that in me and my family, it's special," he continued. "That's my favorite dance of the show just because of what it meant to her and I really wanted to nail that dance."

"Those are the qualities that I'm going to take away from this competition -- more than any perfect score and dance, like this, this is the stuff that I'm going to remember forever," added Arnold. "I'm so glad that we had that moment together because that's something that you strive for on the show. Real moments like that."

WATCH: Sharna Burgess and Bonner Bolton React to 'DWTS' Elimination, Len Goodman's Harsh Comments

On top of DWTS and raising three kids with his wife, Hyla Ross, the athlete has also been busy promoting his memoir, "Teammate: My Journey in Baseball and a World Series for the Ages," which was released on Tuesday.

"It's going to be a movie," he explained. "Radar Pictures bought the rights and I'm so thankful for that. I mean, I can't even believe what's going on in my life right now. There are so many great things -- we're going to the semi-finals and I have a book coming out tomorrow and a movie -- It's just overwhelming."

"And, actually, I was part of the World Series every one forgot about, right?" he joked. "Ah, man. I'm so blessed right now."

As many #TeamLadyAndTheGramp fans know, Ross retired from pro baseball after a World Series win with the Chicago Cubs last November, in which the Illinois team broke a 108-year curse. But does he have what it takes to take home a mirror ball trophy?

Arnold answered for him, telling ET, "I'm just trying to do the best I can. I'm really just so thankful to still be here and be able to continue this friendship that we're building."

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