David Ortiz thinks he may have discovered one of the reasons why the Chicago Cubs have struggled to win games.

The Boston Red Sox slugger thinks the team's traditional day games are the issue.

"Through the years I've talked to a lot of friends of mine that have played for the Cubs," Ortiz said. "The one thing that everyone talked about was the schedule in Chicago. They get excited walking into a city that's based on baseball, but once they start dealing with the schedule it kind of mentally wears you down."

Ortiz mentioned Alfonso Soriano as one player that didn't like the mixed schedule of day and night games.

"Believe it or not that's one of the biggest issues for that organization to become a winning ballclub," Ortiz added. "When you come down to the Cubs' schedule it's a game-changer, believe it or not. They play so many day games at home and then they have to travel to another city and adjust themselves to the night games."