Buhai, without a top-25 finish at a major, found herself in uncharted territory after notching eight birdies in a seven-under-par 65 at Woburn in Milton Keynes.
Faletau, 29, has 76 caps and his powerful running and destructive and consistent defence have made him an integral part of the Welsh pack since making his debut in 2011.
A sell-out crowd of 65,000 made its displeasure known during the game against a K-League all-stars team, which was delayed for an hour after Juventus arrived late from the airport.
South Africa will leave for Argentina in two groups over the weekend with the Rugby Championship trophy in their sights as coach Rassie Erasmus declared their camp in Auckland a success.
Fears that Ebola could spread into neighbouring countries have mounted since mid-July, when the disease claimed its first fatality in Goma, a city of two million people that lies adjacent to Gisenyi.
Three World Cup venues – Kamaishi, Osaka and Kumagaya – are hosting Japan warm-up matches, which should give organisers a chance to fine-tune their final preparations.