Wimbledon: Defending champion Venus Williams survived a second-set blip to beat Martina Jose Sanchez Martinez and reach the last 16 of this year's Wimbledon.
Having struggled at times against British opponents Naomi Cavaday and Anne Keothavong in the previous rounds, Williams looked set for a more comfortable victory when she led by a set and 4-2.
However, the Spanish qualifier reeled off three games in a row to surprise the seventh seed before finally going down 6-1 7-5.
Williams will now meet Russia's Alisa Kleybanova on Monday for a place in the quarter-finals.
The world number 42, playing at Wimbledon for the first time, was a 6-4 6-4 winner over Japanese veteran Ai Sugiyama.
Fifth seed Elena Dementieva was given a tough workout by Gisela Dulko today but avoided becoming the latest high-profile casualty at this unpredictable tournament.
Argentine Dulko fought hard all the way but came off second best, going down 7-6 (7/2) 7-5 on Court Two.
Thai grasscourt expert Tamarine Tanasugarn continued her love affair with SW19, coming from a set down to beat New Zealand's Marina Erakovic.
She will now face the winner of the match between Jelena Jankovic and Caroline Wozniacki.
It will be Tanasugarn's seventh appearance in the fourth round, although she has yet to reach the last eight.