PHOENIX—It was a shooting slog for much of Wednesday night for the Phoenix Suns, who bricked short jumpers, 3-pointers and just about everything in between. But then Cam Johnson hit a couple of 3-pointers. Chris Paul added another. Jae Crowder got in the act with another and Devin Booker hit the dagger with 50 seconds left: a long, off-balance triple that capped a 37-point team outburst in the final quarter. It’s awfully hard to hold down the Suns for 48 minutes. That’s a big reason they’re riding the longest current winning streak in the NBA. Booker scored 24 points, Deandre Ayton had 19 points and 13 rebounds and the Suns ran their winning streak to 10 games, beating the Dallas Mavericks 105–98. It’s the longest winning streak for the Suns since the 2009-10 season. “We didn’t shoot a great number tonight but when we needed it, guys just stepped up,” …