Alexander: Aldrich Potgieter is having one of those (really good) weeks

PACIFIC PALISADES — When we think of the PGA Tour, we think of the big names. During this week’s Genesis Invitational at Riviera, you might be checking the score list to see how Rory McIlroy is doing (a solid second behind Jacob Bridgeman, although six shots back at 13-under), or maybe Scottie Scheffler (tied for 20th at 5-under after recovering from a tough opening round, yet still lurking). But the soul of the tour, its gristle and fiber, is that mass of players who grind it out from week to week, fighting to make the cut and aiming for that occasional great round or successful tournament as the impetus that keeps them going. Players like Aldrich Potgieter, a 21-year-old South...