Tiers go by win rate, discounted for small samples: the top 15% are S, the next 25% A. Season 2 starts when Season 1 ends: Deadlock Season 2.
Over the last 30 days of Season 1 the top hero is Graves, winning 57.4% of 1,923,898 games across all ranks. S tier: Graves, Rat King, Paige, Seven, Victor, Kelvin and Haze.
Low elo (Obscurus to Acolyte): Graves (55.1%), Rat King (54.9%) and Paige (54.7%). High elo (Phantom to Eternus): Baba (54.5%), Wraith (53.7%) and Ivy (53.7%).
Until Season 1 ends, yes, it updates with each day's games. After the end it covers the season's last 30 days and stays as it is.
| S | 54.3%1,351,124 games | 1,351,124 |
| S | 54.1%585,298 games | 585,298 |
| S | 53.6%1,962,509 games | 1,962,509 |
| A | 53.3%1,129,676 games | 1,129,676 |
| A | 52.8%861,604 games | 861,604 |
| A | 51.8%929,088 games | 929,088 |
| A | 51.7%1,257,358 games | 1,257,358 |
| A | 51.4%1,293,583 games | 1,293,583 |
| A | 51.3%1,009,419 games | 1,009,419 |
| A | 50.9%1,499,271 games | 1,499,271 |
| A | 50.8%1,371,454 games | 1,371,454 |
| A | 50.7%1,478,730 games | 1,478,730 |
| A | 50.5%1,628,746 games | 1,628,746 |
| A | 49.8%856,057 games | 856,057 |
| B | 49.6%1,835,909 games | 1,835,909 |
| B | 49.2%1,606,008 games | 1,606,008 |
| B | 49.2%1,372,649 games | 1,372,649 |
| B | 49.1%1,218,939 games | 1,218,939 |
| B | 48.6%532,638 games | 532,638 |
| B | 48.5%1,466,431 games | 1,466,431 |
| B | 48.3%1,585,002 games | 1,585,002 |
| B | 48.1%652,937 games | 652,937 |
| B | 48.0%1,358,456 games | 1,358,456 |
| B | 47.9%532,435 games | 532,435 |
| B | 47.4%1,180,284 games | 1,180,284 |
| B | 47.2%725,889 games | 725,889 |
| B | 47.2%870,287 games | 870,287 |
| B | 47.1%1,788,583 games | 1,788,583 |
| B | 46.3%617,860 games | 617,860 |
| C | 46.1%1,070,210 games | 1,070,210 |
| C | 46.0%1,156,596 games | 1,156,596 |
| C | 46.0%1,339,025 games | 1,339,025 |
| C | 45.9%697,367 games | 697,367 |
| C | 45.9%554,468 games | 554,468 |
| C | 45.8%1,427,029 games | 1,427,029 |
| C | 45.3%1,726,449 games | 1,726,449 |
| C | 44.8%1,096,907 games | 1,096,907 |
| C | 44.8%451,331 games | 451,331 |
| C | 44.5%763,538 games | 763,538 |
| C | 44.5%503,952 games | 503,952 |