Robbie Grossman #8 of the Oakland Athletics hits a home run against the Seattle Mariners in the first inning of their second game of a double header at RingCentral Coliseum on September 26, 2020 in Oakland, California. DETROIT – The Detroit Tigers have signed veteran free agent outfielder Robbie Grossman to a two-year deal, according to reports. Grossman spent the last two seasons with the Oakland Athletics after three years each with the Houston Astros and Minnesota Twins. Robbie Grossman’s 2-year, $10 million deal with the #Tigers is the largest by a free-agent outfielder in this painfully slow winter. Another night of Detroit sports: Tigers prospect, Pistons top draft pick both injuredGrossman has a career .730 OPS across 2,362 at-bats.