Theo Epstein, Jed Hoyer, Josh Byrnes, Ben Cherington Play GM Musical Chairs

Being a baseball GM as of late has become something of a merry-go-round ride. Still in the thick of the World Series, MLB is getting dizzy with management changes within big-name ball clubs.

The official announcement came Friday night: Theo Epstein is leaving the Red Sox to become the Cubs’ president. That was the first domino.

With a big hole to fill, Boston quickly slotted assistant GM Ben Cherington into Epstein’s former seat. Both teams will hold press conferences on Tuesday, the next off day in the World Series, to present their new bosses.

Another domino fell when Epstein decided to poach long-time friend (and former Red Sox assistant) Jed Hoyer, the Padres’ GM, and bring him into the fold. This would be Epstein’s first move as President since he managed to swing a deal where Hoyer comes in as the Cubs’ GM.

So in one decision, Epstein has rocked the executive world of three franchises. And, it seems, a lot of nepotism was in play since Cherington and Hoyer worked together as co-GMs during Epstein’s absence from the Red Sox in ’05. Remember too, it was Hoyer who traded All Star first baseman Adrian Gonzalez to the Red Sox.

The good news for the Padres is that they get a few players in exchange for letting Hoyer go. The San Diego club is turning the reigns over to Josh Byrnes — another former Theo Epstein assistant — who was the Padres’ former Vice President of Baseball Operations.

All this and baseball hasn’t even hit the off-season yet.