in-run betting
n.— «A particular danger of Internet betting is what is known as “in-run betting,” the ability to bet on a match in progress, either on the final result or any number of propositions, such as how many double-faults a player might make in the second set.» —“ATP pushes on with inquiries into online betting” by Jeff Williams in Melville, New York amNY.com Sept. 2, 2008. (source: Double-Tongued Dictionary)