| Best Ai | |
| Type: | greatest |
| Artist: | Ai |
| Cover: | Ai - Best Ai.png |
| Recorded: | 2003–2009 |
| Length: | 79:13 |
| Prev Title: | Viva Ai |
| Prev Year: | 2009 |
| Next Title: | The Last Ai |
| Next Year: | 2010 |
Best Ai is the first greatest hits album by Japanese-American singer-songwriter Ai, released on September 16, 2009, by Island Records and Universal Sigma. The album was released in three editions: limited CD+DVD, CD only and "Arienai Price" (low-priced) editions. Best Ai debuted at number 2 on the daily Oricon albums chart but switched back and forth between number 1 and number 2 several times during its release week. The album went on to debut atop the weekly albums chart with 81,663 copies sold, beating the second-place holder Takeshi Tsuruno's Tsuruno Oto by merely 1,332 units and becoming her first number-one album.[1]
The album is certified Platinum for shipment of 250,000 copies.
| Peak position | |
| Japanese Albums (Oricon)[2] | 1 |
|---|---|
| Japan Albums Chart (SoundScan)[3] CD+DVD | 2 |
| Japan Albums Chart (SoundScan) CD-only | 4 |
| Japanese Top Albums (Billboard Japan)[4] | 1 |
| Taiwan J-Pop Chart (G-Music)[5] | 18 |
| Taiwan J-Pop/K-Pop Chart (Five Music)[6] | 14 |
| South Korean Albums (Circle)[7] | 46 |
| Peak position | ||
| Japanese Albums (Oricon)[8] | 5 |
|---|
| Position | ||
| Japanese Albums (Oricon)[9] | 35 |
|---|