The Chicago White Sox are off to a great start to 2016, currently in first place ahead of the defending world champion Kansas City Royals in the AL Central. However, part of Chicago’s success is due to the currently last-place team in the National League Central, the Cincinnati Reds.

The cleanup hitter in the middle of the batting order came to Chicago via a winter trade with Cincinnati. Todd Frazier leads the White Sox in home runs, and has been their biggest power threat during the slow start of 2014 Rookie of the Year Jose Abreu.

Frazier isn’t the only former Reds player who has been a key part of their success this season. Catcher Dioneer Navarro, who left Cincinnati to help Toronto win a division championship last year, has provided Chicago with key hitting and invaluable play.

One such pitcher he has helped build himself is the Cincinnati Red. Mat Latos left Cincinnati after 2014 but overcame last year’s struggles to win each of his decisions thus far with Chicago.

It was last year that the Reds had a similar positive effect on the baseball club on the north side of the Windy City. The Cubs reached the National League Championship Series last year with contributions from former Cincinnati players. David Ross, who recently caught Jake Arrieta’s no-hitter against the Reds, served as Chicago’s backup catcher. Left-hander Travis Wood became a flexible part of the Cubs’ pitching staff, splitting time between starting and coming out of the bullpen.

Joining the Cubs and White Sox in first place right now are the Washington Nationals, who are also in part beholden to the Reds. Manager Dusty Baker led Cincinnati to four postseason appearances during his tenure, and now he’s led the Nationals to a great start to his first season in charge of Washington.

Baker has had help from some of his former players with the Reds, especially Chris Heisey. The veteran played for Baker in Cincinnati for four seasons and is now the fourth outfielder for the Nationals. Washington reliever Matt Belisle is also a former Reds player who was in the Cincinnati bullpen during Baker’s tenure there.

Other former Reds are helping different teams in 2016, in addition to Toronto’s All-Star slugger Edwin Encarnacion, Yankees shortstop Didi Gregorius and Texas outfielder Shin soo-Choo. Starting pitcher Mike Leake and catcher Brayan Pena play for Cincinnati’s rival, the St. Louis Cardinals. Marlon Byrd is starting in the outfield for the Cleveland Indians, and Ryan Hanigan is now the backup catcher in Boston. Cincinnati’s first-round pick of several years ago, Yasmani Grandal, is still the starting catcher for the Los Angeles Dodgers, and Yonder Alonso is now the everyday first baseman for the Oakland A’s.

Cincinnati fans, who so far haven’t had much to celebrate in 2016, should wait to see how much their former closer Aroldis Chapman will help the last-place Yankees. Because he violated Major League Baseball’s domestic violence policy, Chapman is ending a 30-game suspension and should return next week to bolster New York’s chances to turn the season around.