Roger Federer celebrates after he beats Milos Raonic in the final tennis match of the ATP Mercedes Cup in Stuttgart, Sunday June 17, 2018. (Marijan Murat//dpa via AP)

LONDON (AP) Roger Federer is back at No. 1 in the ATP rankings, once again swapping spots with Rafael Nadal.

Federer's title at the grass-court tournament in Stuttgart, Germany, last week pushed him up from No. 2 on Monday.

Nadal dropped down from No. 1 after sitting out last week following his 11th French Open championship earlier in the month.

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