Josh Naylor is headed to the American League. The Diamondbacks’ first baseman is going to the Mariners in a trade on Thursday night, The Post’s Jon Heyman confirmed Minor league pitchers Ashton Izzi and Brandyn Garcia are headed back to Arizona.

We have our first significant deal a week before Major League Baseball's July 31 trade deadline, with the Arizona Diamondbacks sending first baseman Josh Naylor to the Seattle Mariners, the teams announced Thursday night.

PHOENIX -- The Seattle Mariners acquired first baseman Josh Naylor from the Arizona Diamondbacks on Thursday as the franchise tries to beef up its lineup ahead of the July 31 trade deadline.