The new mixed doubles format has stirred controversy in the tennis community.

Rayo Vallecano has signed Senegalese center-back Nobel Mendy from Real Betis to strengthen its back line for the new season.

After being told about this “reimagined” version of the US Open mixed doubles, which has been moved to the preliminary “Fan Week” and granted a $1m (£740,000) first prize, he took only three days to s...