Whose Line Is It Anyway? sure improv’d The CW’s lot.

Premiering to 2.9 million total viewers, the reboot delivered the network’s second-most watched series launch since Sept. 2011 (trailing only Arrow) and its biggest audience in the time slot since Nov. 2009 — all while batting against the MLB All-Star Game.

The CW also notes that Whose Line scored the network’s best 18-34 demo rating for a premiere since Sept. 2011, and only trailed the All-Star Game in that measure from 8 to 9. In 18-49, the show scored a 1.1.

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Leading out of that, the premiere of The CW’s Perfect Score dating thing retained all of 890,000 viewers, while mustering a 0.3 demo. And I thought I had bad dates.

Topping Tuesday in both total viewers and in the 18-49 demo was Fox’s coverage of the aforementioned MLB All-Star Game, which featured an ubere-Mo-tional tip of the cap to Yankees closer extraordinaire Mariano Rivera. Final, reportable numbers for the live sporting event won’t be in for a while yet, but prelim data suggests the telecast was on par with last year’s record low.

Elsewhere, ABC’s Extreme Weight Loss (3.5 mil/1.1) dipped a bit and NBC’s America’s Got Talent (9.8 mil/2.5) ticked down a tenth.