The 2013 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 40th edition of the event known this year as the Rakuten Japan Open Tennis Championships, and part of the 500 Series of the 2013 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from September 30 till October 6, 2013. First-seeded Juan Martín del Potro won the singles title.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles[1] | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| width=130 bgcolor=ededed | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| style=background:#f5f5f5 | Singles | $312,000 | $140,700 | $66,650 | $32,160 | $16,400 | $9,020 | $1,020 | $565 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#f5f5f5 | Doubles | $92,200 | $41,600 | $19,610 | $9,480 | $4,870 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Juan Martín del Potro | 7 | 1 | ||
| Jo-Wilfried Tsonga | 8 | 2 | ||
| Milos Raonic | 11 | 3 | ||
| Kei Nishikori | 12 | 4 | ||
| Gilles Simon | 14 | 5 | ||
| Nicolás Almagro | 17 | 6 | ||
| Kevin Anderson | 21 | 7 | ||
| Janko Tipsarević | 23 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Michaël Llodra (back injury)
Andy Murray (back surgery) Gilles Simon (groin injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Bob Bryan | Mike Bryan | 2 | 1 | |||
 Spain | Marcel Granollers | Spain | Marc López | 17 | 2 | |
| Ivan Dodig |  Brazil | Marcelo Melo | 32 | 3 | ||
 India | Rohan Bopanna | France | Édouard Roger-Vasselin | 33 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Michaël Llodra (back injury)See main article: 2013 Rakuten Japan Open Tennis Championships – Singles.
Juan Martín del Potro defeated 
Milos Raonic, 7–6(7–5), 7–5See main article: 2013 Rakuten Japan Open Tennis Championships – Doubles.
Rohan Bopanna / Édouard Roger-Vasselin defeated Jamie Murray / 
John Peers, 7–6(7–5), 6–4
