Johncock's winless drought came to an end when he joined the STP/Patrick Racing team ahead of the 1973 USAC season. At the 1973 Indianapolis 500, a major accident at the start involving Salt Walther, coupled with two days of rain, postponed the race until late Wednesday afternoon. When the race was held, Johncock's teammate Swede Savage was severely injured in a fiery crash on lap 58. A moment later, Armando Teran, a pit crew member on the same STP/Patrick team, was struck by a fire truck going northbound in the pits, and was fatally injured at the scene. When the race resumed, Johncock took the lead on lap 73 and held it until rain fell again on the 133rd lap. Nearing 6 p.m., the race was red flagged and declared over. After a short and muted victory lane celebration, Johncock went to visit Savage at the hospital. Afterward, the celebratory victory banquet was cancelled. Instead, Johncock and his crew went to a local fast-food joint for hamburgers. 33 days after the race, Savage died from his injuries.