According to ESPN's Darren Rovell, the European betting outfit known as Ladbrokes is in on the Federer double-twin action.

It's Two Boys! Mirka Federer Gives Birth to Second Set of Twins

A day after Federer's second set of twins were born last Tuesday, Ladbrokes said that it was offering 10,000 to 1 odds that all four of Roger and Mirka's twins would someday feature in a Wimbledon mixed doubles final.

Due to the ridiculously high odds on the bet, a Ladbrokes spokesperson told ESPN that the maximum allowable bet would be 10 British pounds ($17).

Odds were also released on other Federer twin possibilities:

The odds of any Federer twin winning a Wimbledon title was set at 100 to 1, while the odds of any combination of Federer's four children combining for a Wimbledon doubles title was 33-1.

In a non-tennis but related bet, bettors can wager on whether or not Mirka will give birth to a third set of twins in the future. The odds? 1,000 to 1.