user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Achievements' regarding 'Horacio Nava'
Table Content:
| Year | Competition | Venue | Position | Event | Notes |
| --- | --- | --- | --- | --- | --- |
| Representing Mexico | Representing Mexico | Representing Mexico | Representing Mexico | Representing Mexico | Representing Mexico |
| 1999 | World Youth Championships | Bydgoszcz, Poland | 5th | 10,000 m track walk | 44:41.89 |
| 2001 | Pan American Junior Championships | Santa Fe, Argentina | 1st | 10,000 m track walk | 43:33.92 |
| 2003 | Pan American Race Walking Cup | Tijuana, México | – | 50 km | DNF |
| 2003 | Universiade | Daegu, South Korea | 8th | 20 km | 1:26:24 |
| 2004 | NACAC Under-23 Championships | Sherbrooke, Quebec, Canada | 1st | 20,000 m walk | 1:33:29 |
| 2005 | Pan American Race Walking Cup | Lima, Peru | 2nd | 50 km | 3:59:26 A |
| 2005 | Pan American Race Walking Cup | Lima, Peru | 1st | Team (50 km) | 6 pts |
| 2005 | World Championships | Helsinki, Finland | 9th | 50 km | 3:53:57 |
| 2006 | World Race Walking Cup | A Coruña, Spain | 7th | 50 km | 3:48:22 |
| 2007 | Pan American Games | Rio, Brazil | 2nd | 50 km | 3:52.35 |
| 2007 | World Championships | Osaka, Japan | 9th | 50 km | 3:58:17 |
| 2008 | World Race Walking Cup | Cheboksary, Russia | 5th | 50 km | 3:47:55 |
| 2008 | World Race Walking Cup | Cheboksary, Russia | 2nd | Team (50 km) | 29 pts |
| 2008 | Olympic Games | Beijing, China | 6th | 50 km | 3:45:21 |
| 2009 | World Championships | Berlin, Germany | 19th | 50 km | 3:56:26 |
| 2010 | World Race Walking Cup | Chihuahua, Mexico | 2nd | 50 km | 3:54:16 |
| 2010 | World Race Walking Cup | Chihuahua, Mexico | 2nd | Team (50 km) | 22 pts |
| 2010 | Central American and Caribbean Games | Mayagüez, Puerto Rico | 1st | 50 km | 3:56:45 |
| 2011 | World Championships | Daegu, South Korea | 20th | 20 km | 1:24:15 |
| 2011 | Pan American Games | Guadalajara, Mexico | 1st | 50 km | 3:48:58 |
| 2012 | World Race Walking Cup | Saransk, Russia | 11th | 50 km | 3:51:23 |
| 2012 | World Race Walking Cup | Saransk, Russia | 4th | Team (50 km) | 49 pts |
| 2012 | Olympic Games | London, United Kingdom | 15th | 50 km | 3:46:59 |
| 2013 | Pan American Race Walking Cup | Ciudad de Guatemala, Guatemala | 2nd | 50 km | 3:58:00 A |
| 2013 | Pan American Race Walking Cup | Ciudad de Guatemala, Guatemala | 1st | Team (50 km) | 12 pts |
| 2013 | World Championships | Moscow, Russia | 32nd | 50 km | 3:58:09 |
| 2014 | Central American and Caribbean Games | Xalapa, México | 1st | 20 km | 1:25:05 A |
| 2015 | Pan American Race Walking Cup | Arica, Chile | 1st | 50 km | 3:45:41 |
| 2015 | Pan American Race Walking Cup | Arica, Chile | 1st | Team (50 km) | 7 pts |
| 2015 | World Championships | Beijing, China | 28th | 20 km walk | 1:24:40 |


Question
In what events was Horacio Nava runner up?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Horacio Nava was the runner-up over 50 km at the 2007 Pan American Games and the 2010 World Race Walking Cup."]