Javy Baez’s wOBA (weighted on-base average)
Baez is currently boasting a wOBA sits at .408 which is 21st in all of baseball. Anything over .400 is considered "excellent" and it's safe to say that the Cubs could not have gone 13-5 in their last 18 games without the contributions that the star shortstop provided.
Jason Heyward's walk rate
The Cubs outfielder has been mostly awful since coming to Chicago. This season has been a different story. His slashline is .309/.426/.506 and his walk rate is currently sitting at 17.5 percent. It's safe to say that if he can continue that over the course of the season, it's going to be easily his best as a Cub. That walk rate shows he's seeing the ball well and swinging at pitches he can do something with.
Albert Almora's OAA rating
While Almora has been an offensive liability so far this year, he's definitely been a defensive plus. His outs above average is now sitting at three. There are only three players in the Major Leagues that have better defensive ratings right now. The Cubs are Top-5 in baseball
Willson Contreras' framing runs
Willson Contreras has never been great at framing. He's been really, really bad so far this season. His Framing Runs, which is a metric used by Baseball Prospectus currently sits a -2.2. Because some numbers can be hard to tell whether they are good or bad, or just how bad, let me put it this way. Of 73 catchers that are being tracked by this stat, Willson is 72nd.
The Cubs wRC+ rating from leadoff
The Cubs have been searching for a reliable leadoff hitter since Dexter Fowler went to St. Louis after the 2016 season. This year, the combination of Ben Zobrist, Albert Almora and Daniel Descalso have contributed a 69 wRC+ from the leadoff spot. That's only better than Baltimore, Miami, Detroit and San Francisco. It's kindof amazing the Cubs did win 13 of their final 18 in April with that number.