Rafael Nadal was locked in an epic battle on Philippe-Chatrier before the rain ended play early on Wednesday night.
The world No. 1 found himself a set and a break down to Diego Schwartzman, with his French Open hopes hanging in the balance, before rain initially stopped play.
After a brief return to the court, Nadals situation looked far less perilous as he won three games on the spin and moved just two points away from levelling the match at 30-15, 4-6 5-3.
In the other mens quarter-final, Juan Martin del Potro and Marin Cilic were locked at 5-5 in a first-set tiebreaker.
Play will resume on Thursday, with both matches finely poised.
Schwartzman came out the traps flying.
The gritty Argentine went toe-to-toe with the world No. 1, breaking him three times and booking two set points.
At 40-30, 5-4 up there was off-court drama to complement the immense tension as a member of the crowd collapsed. But after a lengthy delay, Schwartzman ended Nadals run of 37-straight sets won at Roland Garros – a run that stretched back to 2015.
The Spanish No. 1 required treatment at the change of ends for a right wrist problems and at the start of the second, Schwartzman struck again.
Though Nadal hit back to level for 2-2, the plucky Argentinian broke again with a thumping forehand to regain control.
Unfortunately for the 25-year-old, the rain came. Both players were shepherded off court with the match at a crucial junction.
Rather inevitably, when play resumed, Nadal broke straight away.
Schwartzman slapped his racquet against the top of the net after missing a routine backhand volley with the court at his mercy to hand the Spaniard break point. Moments later, the world No. 1 was level and screaming VAMOS!!! VAMOS!!! VAMOS!!!.
Things quickly went from bad to worse for the 11th seed. A fired up Nadal was striking the ball relentlessly to reel off three straight games and move two points away from levelling the match before the rain came tumbling down again. Play was soon cancelled for the day.