Ken Griffey Jr. could be returning soon to the city where his major league career started. Two baseball sources have told ESPN that the Mariners have made "significant progress" in negotiations to bring the former Reds outfielder back to Seattle. Griffey, whom the Mariners traded to the Reds in 2000 for pitcher Brett Tomko, outfielder Mike Cameron and two other players, is reportedly seeking a one-year deal with a base salary of around $5 million. Last summer, the Reds traded Griffey to the White Sox in a deadline deal. After hitting his 600th career home run in Florida on June 9, Griffey hit just 11 homers the rest of the season, finishing with 18 homers and 71 RBI in 490 ...