Australia were in dire straits against England in Birmingham at 122-8 but their last two wickets more than doubled the score and Smith was last man out for 144 in a total of 284.
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.