By Keith Idec

Even in direct competition with a pay-per-view extravaganza, boxing fans tuned in to watch Miguel Cotto’s return to the ring.

The Cotto-Kamegai match ended before Floyd Mayweather Jr.’s technical knockout of Conor McGregor began because pay-per-view ordering glitches caused the start of Mayweather-McGregor to be delayed by about a half hour.

Cable and satellite customers in certain parts of the United States had difficulty ordering the Showtime Pay-Per-View broadcast that featured Mayweather-McGregor. Mayweather acknowledged after his victory that he and McGregor remained in their dressing rooms until the potentially costly issue was resolved.

Mayweather-McGregor was expected to negatively impact Cotto-Kamegai ratings because at least portions of the fights were expected to air simultaneously.

The Cotto-Kamegai bout ended at approximately 11:45 p.m. ET/8:45 p.m. PT at StubHub Center in Carson, California, about 20 minutes before the delayed start of Mayweather-McGregor at T-Mobile Arena in Las Vegas.

Puerto Rico’s Cotto, 36, fought for the first time since losing a unanimous decision to Mexican superstar Canelo Alvarez in November 2015 at Mandalay Bay Events Center in Las Vegas. Cotto (41-5, 33 KOs) won the vacant WBO super welterweight title by out-boxing Japan’s Kamegai (27-4-2, 24 KOs) in their 12-round championship match (120-108, 119-109, 118-110).

HBO’s telecast began Saturday night with Rey Vargas’ victory over Ronny Rios in a 12-round, super bantamweight bout. Vargas-Rios was watched by a peak audience of 687,000 viewers and attracted an average viewership of 524,000.

Mexico’s Vargas (30-0, 22 KOs) out-pointed Rios (28-2, 12 KOs), of Santa Ana, California, by scores of 118-110, 118-110 and 115-113 to retain his WBC 122-pound championship.

The Vargas-Rios telecast also directly competed with part of the Mayweather-McGregor undercard.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.