Early results suggested that Moon, the Democratic Party's candidate in the election to replace ousted president Park Geun-hye.
The 17-year-old World Cup gold-medallist shot 244.5 to finish second on the podium behind North Korea's Kim Song Guk.
Mattis' remarks came after Trump warned that 'appeasement' won't work with Pyongyang.
US envoy Joseph Di Trani and the Department's Korean Affairs office head James Foster met with North Korean officials in New York last Friday, but with no apparent outcome.
The US president said the summit will be more than a photo-op.
Brazil shocked and other big upsets at World Cup qualifiers played on Tuesday
The three commemorative coins -- in gold, silver and nickel-plated -- feature an "affirmative handshake" between the two leaders, the scheduled date of the summit, the flags of both countries and the national flowers.
South and North Korea have agreed to officially open railways and roads linking the two countries in late October, South Korea said on Sunday.\n\n
Welcoming the North Korean decision to suspend its nuclear activities as a "positive step" forward, the White House has said it took a cautious note based on its past experience, adding this now needs to be followed by actions.
Amid raging tension in the Korean peninsula, the US is moving some of its key military assets, including a warship and a sea-based radar platform, closer to the North Korean coast to monitor Pyongyang's military moves.
Top officials from both countries called for closer co-operation between North and South.
Trump's tweet comes after Kim Jong-un blasted the US President Donald Trump as "mentally deranged" and vowed to make him pay dearly for threatening to destroy his country.
Sonia Chahal stormed into the finals of Women's World Boxing Championships by outclassing her North Korean opponent Jo Son Hwa
Amidst growing tension in the Korean peninsula and increasing threat from North Korea, United States Defence Secretary Chuck Hagel has spoken to his South Korean counterpart Kim Kwan Jin to review the security situation.
Reacting strongly to North Korea over its statement claiming that its missiles can Strike inside United States territory, the US administration said the North Korean regime should spend its resources and energy on feeding its own people rather than bragging about its missile capabilities.
'Yes, I do have a very good idea but I can't talk about it now. I just wish him well'
'North Korea could choose to go China's way by selectively opening up the economy, but Kim does not seem enthused by the idea.' 'Getting Pyongyang to give up the nuclear programme may be the best outcome Trump can hope for at the moment,' says Vikram Johri.
Gold-medal favorites United States, Japan and Brazil won their matches on the first day of women's football on Wednesday, but all the talk was about an embarrassing mistake by organizers who displayed the South Korean flag instead of the North Korean one before a game in Glasgow.
'Kim has once again shown astuteness and statesmanship by securing China's support precisely just when it matters most to him,' points out Ambassador M K Bhadrakumar.
The US president praised Kim as "very open" and "terrific", despite the glacial pace of progress toward denuclearisation on the Korean Peninsula.
In their first summit since Chinese President Hu Jintao assumed power last year, the two leaders discussed the nuclear crisis and Chinese aid for North Korea.
It has proposed to stop its weapons programme. The proposal followed South Korean chief negotiator Lee Soo-Hyuch's remarks that Russia, China and his own country were willing to provide energy aid to North Korea.
'The frequent coaching camps... too are contributing to the cause, and constant collaboration is only helping the team get that elusive medal at the Olympics.'
However, the 6,000-odd athletes, 3,000 performers, 300,000 spectators and dozens of world leaders had to endure heavy rain for much of the event.
Three days after he was shot while delivering a speech in the western Japanese city of Nara, Abe Shinzo, Japan's longest serving prime minister, began his final journey in Tokyo.
The US is unwittingly proving to the North Korean leadership that its experimentation with transparency was unwise, says B Raman
The blast at Ryongchong Station, 50 km north of Pyongyang, occured hours after North Korean leader Kim Jong-il passed through the station returning from from Beijing.
In a bid to boost their bilateral ties, India and South Korea on Wednesday decided to step up efforts to take their economic partnership to a higher level by utilising synergies in trade, investment and hi-tech areas.
South Korean auto giant Hyundai Motor Company is considering tax implications of listing its Indian unit before taking a final call, according to sources privy to the development. Hyundai Motor is mulling an initial public offering (IPO) for its Indian arm to raise around $3 billion (at a valuation of up to $30 billion), and talks are in the early stages between the company and bankers, banking sources revealed. Hyundai Motor India Ltd (HMIL), however, declined to comment on the development.
The talks between the two premiers comes a day after US secretary of State Condoleezza Rice's visit to Beijing.
FIFA president Sepp Blatter was showered with paper money by a protester before the start of a press conference in Zurich on Monday.
'In the run-up to the summit, Trump had indicated that he might strike a nuclear deal in the course of a single meeting or over several days, but as it transpired, Trump departed Singapore soon after the meeting.' 'This raises questions if his aspirations for an ambitious outcome had been scaled back,' says Rajaram Panda.
"President Clinton has safely left North Korea with Laura Ling and Euna Lee," said Matt McKenna, spokesman for Bill Clinton. Clinton apologised to Kim Jong-Il for the behaviour of the two women journalists after which they were released, North Korea media reported.
His latest comments were less harsh than ones he made last month where he threatened "fire and fury" against the Pyongyang regime.
North Korea has abruptly cancelled United Nations Secretary General Ban Ki-moon's visit a day before he was due to arrive.
Indian ace Achanta Sharath Kamal will have to wait for another match to book a ticket for the London Olympics as he succumbed 0-4 to Chinese world number one Ma Long in the Asian table tennis qualifiers in Hong Kong.
Amidst reports that North Korea has invited top American diplomats to Pyongyang for a bilateral dialogue, the United States has asserted that there is no such plan for its officials to travel to the country. The Barack Obama administration also reiterated its condition for having any bilateral dialogue with North Korea within the framework of six-party talks.
Is the military junta in Myanmar trying to acquire a military nuclear capability with North Korean assistance? Or is North Korea trying to shift some of its nuclear facilities to Myanmar to protect them from a possible attack by the US?
Vinesh Phogat locked Paris Olympics quota in the women's 50kg category, reaching the final at the Asian Olympic Qualifier without conceding a single point.
