49ers sign receiver Christian Kirk to a 1-year, $6 million contract, AP source says

The San Francisco 49ers have signed veteran receiver Christian Kirk to a one-year, $6 million contract to add needed depth at ...

MLB test of robot umpires for checked swing calls moving up to Triple-A

Major League Baseball’s experiment of a robot umpire technology system allowing challenges to checked swing calls is moving from Class A to Triple-A.