The San Francisco Giants will begin a season-long celebration of their 60th anniversary on the West Coast when they host the Seattle Mariners in an interleague game Tuesday afternoon. The Giants opened with a four-game split at Los Angeles, where the Dodgers also are honoring their move west in 1958. Left-hander Ty Blach, who pitched the first five innings of a 1-0 win over Clayton Kershaw and the Dodgers on Opening Day, will face Mariners left-hander Marco Gonzales in the Giants' home opener.