On the day the NBA preseason kicked off, the Golden State Warriors signed their starting center. Al Horford is officially in the fold with as of Thursday, signing a two-year deal — which includes a player option for next season — as he enters his 19th season in the league. Horford, 39, verbally committed to sign with Golden State last week, but the transaction was delayed as restricted free agent Jonathan Kuminga weighed multiple contract offers from the Warriors. He finally opted for the two-year, $48.5 million deal this week, setting the books for Golden State to add Horford and free agent guard Seth Curry. Kuminga, 22, was seeking a player option instead of a team option, but the Warriors stood firm.