Grigor Dimitrov, a 22-year-old long on talent but short on results, beat Djokovic in Madrid.
"It's a tough loss, I think I gave everything I had today, " Dimitrov told reporters.
Nadal dropped one set on the way to the final to Grigor Dimitrov.
Mr Dimitrov, who was born in Sozopol, has been loudly proclaiming the authenticity of the discovery.
ECONOMIST: The Bulgarian government recruits an unlikely ally
But there was bad news for Djokovic's conqueror, Dimitrov, who was beaten 3-6 6-4 6-1 by Stanislas Wawrinka.
"Really looking forward to that match, " said Dimitrov, who reached a career-high 31st in the rankings last month.
CNN: Nadal 'relaxed' as rivals struggle at Monte Carlo Masters
Trajkovski's security adviser, Nikola Dimitrov, said the plan was outlined in a letter to NATO Secretary-General George Robertson.
Away from the court, and when he's not working out, Dimitrov has plenty of other interests to keep him busy.
The giant Argentine reached his second successive final at the tournament with a 6-4 6-4 win over Grigor Dimitrov of Bulgaria.
Overshadowing the optimism is a very public row between Bulgaria's diaspora minister, Bozhidar Dimitrov (a history professor), and the country's archaeologists.
ECONOMIST: The Bulgarian government recruits an unlikely ally
Murray will meet Marcos Baghdatis in the third round after his Cypriot opponent Grigor Dimitrov retired through injury when trailing 7-5 4-1.
The Argentine won 6-3, 6-4, and will now face unseeded Bulgarian Grigor Dimitrov who came from a set down to beat Marcos Baghdatis.
The British number one needed 87 minutes to see off Dimitrov and said he was impress by the standard of tennis on show.
Dimitrov is also on a roll, having followed up his opening victory over world No. 10 Janko Tipsarevic by beating Germany's Florian Mayer 6-2 6-4.
CNN: Nadal 'relaxed' as rivals struggle at Monte Carlo Masters
The World No.3 will play Grigor Dimitrov of Bulgaria who reached his first ATP final by edging out Marcos Baghdatis of Cyprus 6-3 5-7 7-6.
The other semifinal will be between 2006 Australian Open finalist Marcos Baghdatis of Cyprus and 21-year-old Bulgarian Grigor Dimitrov, who upset Austrian seventh seed Jurgen Melzer.
"I had kind of rough matches in the past weeks so it gave me of course a lot of confidence, even though I lost them, " Dimitrov said.
Djokovic, seeking to win the only grand slam that has eluded him, brushed off the challenge of Grigor Dimitrov as he beat Bulgaria's rising star 6-2 6-2 6-3.
In the men's section, second seed Andy Murray saw off the challenge of Grigor Dimitrov in straight sets (7-6, 6-3) after the Bulgarian also let a decent lead slip.
Wawrinka, who beat Dimitrov in the third round, earned his place in the final with a 6-3 4-6 6-4 victory against world No. 6 Tomas Berdych in just under two hours.
Mitko Dimitrov, head of Payner, said the grant would be used to create "new jobs for highly qualified experts, mostly young people", according to a Bulgarian TV broadcast seen by BBC Monitoring.
BBC: Bulgaria grant to Payner pop channel prompts EU concern
Dimitrov, 21, is rated as one of the most exciting prospects in world tennis and for a while looked set to become the first man to defeat Nadal in Monte Carlo since 2003.
Murray starts his defense of his Shanghai Masters title against Florian Mayer on Wednesday after the German beat Australia's Bernard Tomic 6-4 6-0 in the first round, while Djokovic faces Grigor Dimitrov of Bulgaria.
After making up for a recent loss to Grigor Dimitrov by beating him 6-2, 6-3, 6-3 to reach the fourth round, the No. 1-ranked Djokovic wowed the center court crowd by addressing them in decent French afterward.
While Dimitrov has yet to propel himself into the top 10 -- he has reached a career-high 28th this year -- he has begun to show signs of improvement, most noticeably during last month's Monte Carlo Masters.
Spanish 10th seed Nicolas Almagro came from 2-1 down to beat Bulgaria's Grigor Dimitrov in five sets to book a tie with Swiss 21st seed Stanislas Wawrinka , who beat 2006 finalist Marcos Baghdatis of Cyprus, 7-6 6-4 5-7 6-1.
Cilic beat 2010 Queen's champion Sam Querrey of the U.S. 6-3 3-6 6-3 in Saturday's semifinals, while 2002 Wimbledon runner-up Nalbandian defeated young Bulgarian Grigor Dimitrov 6-4 6-4, as both matches were played in strong winds hitting the UK capital.
It is the second time in as many tournaments that Dimitrov has cracked when serving for a set against a top-ranked player, having served four double faults when leading world No. 1 Novak Djokovic 5-3 at Indian Wells earlier this month.
Bulgaria's London ambassador, Konstantin Dimitrov, told the BBC that trying to put figures on the number of his compatriots who might migrate when restrictions are eased was "irrelevant", as "most of the Bulgarians who wanted to find work in the UK have already done so".
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