Serena Williams crashes out in third round after shock defeat to Elina Svitolina

• Defending champion beaten 6-4 6-3 by Ukrainian
• Venus and Serena had also exited in first round of doubles

An unpredictable Olympic tennis tournament claimed its biggest scalp of all as Serena Williams crashed out in the third round of the women’s singles.

The world No1 appeared to have a shoulder problem and was close to tears as she lost 6-4, 6-3 to Ukraine’s Elina Svitolina.