Konta digs deep for Miami victory
British number one Johanna Konta had to dig deep to join compatriot Heather Watson in the Miami Open last 16.
Konta, the 24th seed, recovered from a sluggish end to the opening set to beat Russian qualifier Elena Vesnina 4-6 6-1 7-6 (7-3) in two hours and 23 minutes.
The Briton looked to have weathered the storm when she went a break up in the third set but Vesnina fought back.
Konta twice had to serve to stay in the match but held her nerve before taking control of the tie-break.
She will face 32nd seed Monica Niculescu of Romania in the fourth round.