Beaten twice by Nadal in the space of a month, in the Barcelona and Madrid Open finals, Thiem took his revenge by handing the 30-year-old Spaniard a first clay court defeat of the season in Rome.
The list of players who have been defaulted from a tour-level match for on-field misconduct.
Spaniard Garbine Muguruza withdraw from the Italian Open semi-finals with a neck injury on Saturday, eight days before she is due to start the defence of her French Open title at Roland Garros.
World number one Novak Djokovic earned his 1,000th tour-level victory by beating Casper Ruud 6-4, 6-3 on Saturday to reach the Italian Open final.
Top seed Novak Djokovic beat Canadian Felix Auger-Aliassime 7-5, 7-6(1) to reach the semi-finals of the Italian Open on Friday and move within one win of 1,000 career victories.
Novak Djokovic scraped over his first hurdle at the Rome Masters.
The world No 1 is certainly buoyed by the prospect of emulating his achievement of holding all four majors but knows that nothing less than perfection will be required.
Should the 30-year-old three-time Rome champion, ranked 211 in the world, reach the semi-finals, she would almost certainly earn an automatic Wimbledon main draw slot ahead of the May 22 rankings cut-off date.
Maria Sharapova was dogged by injury and controversy as she tried to get her career back on track.
Australian Nick Kyrgios was expelled from the tournament after going wild in the third set of his match against Casper Ruud.
For all their success together, the red dirt isn't Sania Mirza and Martina Hingis' most favourite surface.
World number one Novak Djokovic fended off a resurgent Rafael Nadal 7-5, 7-6 (4) in a pulsating battle on Friday to reach the semi-finals of the Italian Open.
Novak Djokovic came from a set down to beat Rafael Nadal for the fourth time in a row and claim his third Italian Open title with an impressive 4-6, 6-3, 6-3 victory in Rome.
Since returning in January Rafael Nadal looks a man reborn. No wonder it is hard to find anyone not backing him to claim 'La Decima' in Paris.
World number five Alexander Zverev continued his poor recent form as he crashed out of the Italian Open in the second round while Serena Williams had to pull out of the women's draw with a recurring knee injury.