The National Basketball Association will be the first major test of the new competitive landscape. Its agreements with ESPN and Turner run through the 2024-25 season. Most sports and media executives predict that the league will stick with traditional broadcasters for most of its games, while carving out some small portion of rights for a tech company.

“It hedges them for the future and exposes the product to new audiences,” said George Pyne, founder of the sports private equity firm, Bruin Capital, and the former chief operating officer of NASCAR. “They can still have a long-term relationship with network partners but dip their toe in with new media.”

Until then, the best opportunities for Apple and Amazon may be overseas — where Amazon has been active for years — because European soccer leagues resell their rights every two to three years. Amazon recently scooped up rights to Europe’s top tournament, the UEFA Champions League, in Britain, Germany and Italy. It also has rights to France’s Ligue 1, which it offers to Prime Video subscribers for annual fee of about $90, and the English Premier League.

Media companies will be pressured to expand geographically to compete, said Daniel Cohen, who leads global media rights consulting for Octagon, a sports agency. Television broadcasters could also team up to pool their financial firepower, or buy each other outright, to compete with tech giants willing to pay billions for rights like N.F.L. Sunday Ticket.

“It comes down to a Silicon Valley ego thing,” Mr. Cohen said of the high-dollar N.F.L. deal. “I don’t see a road to profitability. I see a road to victory.”

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