Vonn's knee fails in front of Woods

US star still upbeat about Sochi Games despite setback

American speed queen Lindsey Vonn failed to put together a winning run for onlooking boyfriend Tiger Woods on Saturday as her unstable right knee gave way halfway down the course at Val d'Isere.

Vonn insisted the incident would not have major ramifications, saying she would race a maximum of two more events before heading to Sochi to defend her Olympic downhill title in February.