Team Affinity is the most popular program in Diamond Dynasty history, and it allows you to earn plenty of fantastic rewards, such as cards, packs, and Stubs, helping you to significantly upgrade your squad.
In MLB The Show 25, the Team Affinity program is very different than in previous years. It's no longer grouped by divisions, with each team now having its own program and reward path.
This makes it trickier to finish the Team Affinity program and collect all of its rewards. However, this was the developer's goal, as the Team Affinity program is meant to be a big grind and not something you can complete in a few hours.
Despite that, there are a few ways to accelerate the completion process and earn many incredible rewards along the way.
How to Complete Team Affinity Program Fast in MLB The Show 25
There are a few things you can do that will help you complete the Team Affinity program faster. The first thing you should do is complete all the 'Start Here' challenges from every team in the program.

Doing this will reward you with 5k points, which is the exact amount that you need to unlock the first card of every single team. While the cards are either 78 or 79 OVR, they are a solid addition to your squad at this point in the game.
After that, focus on doing the 'Quick Impact Missions' and the 'PXP Missions'. All of the challenges are based on stats, such as home runs, stolen bases, wins, strikeouts, and XP with specific players.
You won't get al of them done in a few hours. As mentioned above, the Team Affinity Program is meant to be a grind in MLB The Show 25. However, if you play games on max-elevation stadiums, you will get some of these missions done pretty quickly. Playing on the easiest difficulty will also help you complete missions at a faster pace.
Focusing on the 'Journey to All-Star Missions' and 'Journey to Finest Missions" is also a great way to earn plenty of XP in a fast way. While the objectives in this mission might take a little bit longer to complete, they will reward you with 20k or 30k XP.

We advise you to play plenty of Conquest and Mini Seasons games, as they are the easiest way for you to complete the Team Affinity challenges, earn a lot of XP, and claim great rewards.
Preferably, play those games in created stadiums with the max-elevation to make it easier to complete certain objectives. Playing against the CPU in the lowest difficulty is also a good way to progress faster in the Team Affinity Program.
Playing online will make it 10 times harder to finish the Team Affinity Program, but you also get progress from online modes. So, if you aren't in a rush to finish the program, just play whatever Diamond Dynasty game mode you prefer.
This will take you a good amount of time, as it's no longer possible to just complete the Team Affinity Program in a couple of hours. However, if you follow these tips, you will complete the program in a much faster and easier way.