Dr Rio

What's most striking about Dr Rio right now is that he's just won this week. On 27 August, he took a race at Carlisle—exactly four years to the day after his first ever win. That sort of longevity in a racing career says something. This isn't a young prospect with a bright future; this is a tested, honest campaigner who still knows how to get his head in front when it matters. His recent form has been patchy—a third last time out, then an eighth before that—but that Carlisle win proves he's far from finished.

The key to understanding Dr Rio is the ground. Put him on normal conditions and his win rate climbs to 33 percent, or one in every three races. That's a dramatic improvement on his overall 12 percent win rate, suggesting he's a horse who knows exactly what he likes underfoot. He also seems to suit longer distances: from 1m6f to 2m, he's won 2 of 8 races. Most of his wins (4 from 34) have come in Class 6 races, the bottom rung of competitive racing, where he's a genuinely dangerous proposition.

Jockey Zak Wheatley has ridden him 26 times, winning 4 of those races—a 15 percent partnership win rate that's notably better than Dr Rio's overall record. The pairing seems to work. Trainer Declan Carroll's Malton yard has had a productive season with 24 winners, and while Dr Rio isn't his flashiest inmate, he's exactly the sort of reliable, battle-hardened type that keeps a racing operation ticking over.