Ramos ended his first Masters final with a double fault that handed Nadal his 70th ATP title on the third match point.
The Spaniard beat David Goffin to set up a final with compatriot Albert Ramos.
Nastase, who is Romania's Fed Cup captain, was heard to say to a member of the team at Friday's press conference ahead of a tie with Britain, Let's see what colour it (the baby) has. Chocolate with milk?
The 12-time Grand Slam champion lost to the Belgian for the first time in six meetings.
Murray was playing only his second match since returning from a five-week lay-off
Murray and Nadal were joined in round three by Stan Wawrinka
The 35-year-old will sit out the remainder of the 2017 season and return next year.
FRANCE’S Antoine Escoffier stunned Germany’s top seed Daniel Altmaier 6-2, 6-7 (2-7), 6-4 to clinch the boys’ singles title of Qatar F2 Futures tournament at the hard courts of Khalifa International Complex last week.
The Serb reached the third round of the first European claycourt tournament of the season.
The 36-year-old defeated Spanish fourth seed Lara Arruabarrena 6-4, 7-5.
The Russian hit out at tennis authorities for failing to warn her that a drug she had been taken had become a banned substance.
GERMANY’S Daniel Altmaier lived up to his top billing by beating France’s Antoine Escoffier 6-4, 6-3 to clinch the boys’ singles title in the Qatar F1 Futures tournament at the Khalifa International Complex last week.
It will be Belgium's second Davis Cup semifinal in three years.