Roger and Mirka met both representing Switzerland in the Sydney Olympics, and married in April 2009. They had their twin girls Myla and Charlene Federer on the 23rd July the same year.
Earlier today Federer pulled out of the Madrid Masters tournament to be with his wife issuing the statement:
I’ve decided to withdraw from Madrid to be with my wife Mirka during these next few exciting weeks for our family. I apologize to my fans and hope to be back in Madrid next year. I’ll be training near my home, and am excited to rejoin the Tour soon!
Federer had recently said he would be willing to miss any tournament, including Roland Garros, to be by his wife's side for the birth.
Source 1 & 2
Women's and Men's doubles teams.
Since @rogerfederer likes the wwe, I'm thinking future tag team champs for his second set of twins. Congrats!— John Isner (@JohnIsner) May 6, 2014
@rogerfederer Felicitaciones, Roger! Please give my best wishes to Mirka. Hope to meet the babies soon!— Juan M. del Potro (@delpotrojuan) May 7, 2014
@rogerfederer congrats to the family!! Great names!!!— Kim Clijsters (@Clijsterskim) May 6, 2014
A BIG Congrats to @rogerfederer and Mirka on the birth of twin boys!!! How lucky is that? Two girls, two boys...great news!— Chris Evert (@ChrissieEvert) May 7, 2014
Double congrats to @rogerfederer and Mirka for their new paternity!!👏Twins again👏Omg!!— Feliciano López (@feliciano_lopez) May 6, 2014