Marcos Giron upset third-seeded Casper Ruud 7–6, 3–6, 6–2 in the first round of the Indian Wells Masters on hard court, delivering a significant upset against the 1.61 favourite. Ruud, seeded to progress comfortably, lost control after a competitive opening set decided by tiebreak. Giron seized momentum in the decider, breaking Ruud's resistance to claim a commanding final set and advance to the second round. The American's aggressive baseline game proved effective against Ruud's typically composed clay-court style on the faster hard surface. The result marks a notable upset at Indian Wells and raises questions about Ruud's form heading into the spring hard-court swing.