Former WTA world No 1 Dinara Safina has claimed that Alexander Zverev must show “willingness” to change in a potential new partnership with Toni Nadal.

Alexander Zverev tried to convince Toni Nadal to become his coach. If Rafael Nadal‘s former coach indeed becomes Zverev’s coach, former player Dinara Safina wonders if Zverev will show a ...