The match-winning feat adds another chapter to the rollercoaster story of the 32-year-old first-five, who is currently in his second stint with Waikato after signing with the province last year.
After returning to Waikato from Bath and the Mitsubishi Dynaboars, the star of the 2011 Rugby World Cup final was picked up by the Chiefs for the second time in his career ahead of the 2016 Super Rugby season as a wider training squad member.
Although his chances were limited for the two-time champions, who finished as semi-finalists this year, Donald shone as captain in their mid-week fixture against the touring Wales side during the international break, setting up two tries and kicking at 100% to win man-of-the-match in a historic 40-7 demolition of the 26-time Six Nations winners.
Waikato currently sit in the fourth play-off spot in the Premiership heading into the final day of the regular season of the Mitre 10 Cup, and are relying on Championship side Southland to gain a result over Tasman to ensure they will be playing a semi-final against Canterbury in Christchurch next week.