US Open semifinals LIVE Alexander Zverev faces tough challenge vs Karen Khachanov Updates from first men’s semi-final at 8pm BST, 3pm EST Andrew Lawrence: in praise of five-set tennis | Mail BillyIt has been smooth sailing for Alexander Zverev for the past few days at the US Open. Key points and original sources are listed below.

• US Open semifinals LIVE Alexander Zverev faces tough challenge vs Karen KhachanovS1

• Updates from first men’s semi-final at 8pm BST, 3pm EST Andrew Lawrence: in praise of five-set tennis | Mail BillyIt has been smooth sailing for Alexander Zverev for the past few days at the US Open. The No 1 seed had to fight his way through two five-setters...S2