Schwartzman treated the crowd to a display of power hitting as the Argentine capitalised on two breaks of serve in each set to wrap up the victory.
Earlier in the day, Brazil's Thiago Monteiro rallied from a set down to overcome claycourt specialist Fernando Verdasco 3-6 6-2 7-5.
Eighth seed Verdasco converted an early break point to take the first set but fatigue crept into his game as he struggled to match his opponent in longer rallies.
At 6-5 down and serving to force a tiebreak, the Spaniard committed four unforced errors to concede defeat after two hours and 10 minutes of play.
World number 146 Monteiro will look to reach only his second semi-final of the season when he takes on Slovakia's Jozef Kovalik, who raced past German Rudolf Molleker 6-4 6-0.
(Reporting by Hardik Vyas in Bengaluru; Editing by Christian Radnedge)
