The pairing has now won two Premier Mandatory events as a team.
The Swiss announced the news on Saturday--he'll make his first appearance in the eternal city since 2016.
The Dutchwoman had luck on her side in the Madrid final.
The World No.1 is on fire behind the baseline against Thiem.
The Swiss says he still needs time to decide on whether he'll play at Rome next week.
Food poisoning knocks Queen's Club champion out of Madrid quarterfinals.
The Spaniard admits he's had his share of troubles in 2019. Are they finally over?
