This year's IndyCar Series will remain at 15 races after series organisers decided not to replace its planned Chinese event.
It was announced on June 13 that the Qingdao street race, scheduled to take place on August 19, would not go ahead, reducing the calendar from 16 events to 15.
Since then a number of alternative venues have been suggested as replacements, with both oval and road courses considered.
But on Monday, IndyCar CEO Randy Bernard confirmed that there would be no further adjustments to the scheduld this year.
"After carefully considering all possible options for an additional race, we felt it was in our best interest to keep our schedule at its current 15-event lineup," said Bernard.
"We want to make sure that when we add events to our roster they have long-term potential and are given every opportunity to be successfully promoted. The more we explored, the more we felt like we were rushing what could be good, long-lasting opportunities for the sport.
"I thank all of the promoters who entertained the possibility of hosting the IndyCar Series this season. It certainly validated what we already knew - there's a lot of interest from venues across North America in hosting our sport."
The series has also announced that the season finale at Fontana on September 15 will be extended from 400 to 500 miles. The two-mile superspeedway last hosted a 500 mile IndyCar event in 2002, which was won by Jimmy Vasser.