Make riding fun for the horse
One of my last horses, Doc, had the same issue. And although he loved treats he would rather run away from me then eat the sugar cubes I had to offer so...
Pat Parelli has articles and recommendations on what to do for a horse that runs away in a pasture. I would read up on those because that’s what i did with Doc and after a year of me leasing him he ran to me in the pasture. Good luck!
lunge for respect & join up exercise.
My mother had a very smart stock horse that was also a pain to catch but was always easy with persuasion. I.e. bread! One shake of the bread bag and she would be all over you like a fly on a summers day😂 in other words food is always the answer🙋🏽
When he comes to you reward him with food and maybe try join up
I would suggest make it slightly smaller. I have my paddock divided into 6. around 50x20. two are like 70x70. but he gets to run around and is easy to catch. and if he wants to mess around I half it with a reel and make him lunge until he realises that he's going to keep running until I make him stop. he stops as soon as I let him and I can catch him. usually by then he's done a good workout and I don't need to ride XD I usually set poles to when he's like that and do what I was planing under saddle but hey you can't always get what you want done. it's only happened the very few times. sometimes you just gotta do what you goitta do. hope this helps. also a treat goes a long way >.>
Here’s what I would do: for about 5 times in a row, always give the horse a treat when you catch him and i would associate your voice with giving him a treat. then, the next time you go, simply call him and hope that he’ll come to you due to knowing you have a treat. Don’t chase him and make him take an interest in you and come to you.
Every time you go to catch the horse in the pasture give him a treat.... The horse will associate you with treats and want to be around you.....