Here we are, the start of one of the hardest races of the Continental calendar. Expect fireworks from the mountain goats as this classic climbs to over 3000m! The big favourite pre-race is obviously Arroyo, with Moreno and Menchov both also being mentioned.
It's a sunny day as the riders ride over the startline. Soon there are attacks with a few riders looking to get into the breakaway. The first of these contains five riders, namely Tiernan-Locke, Selander, Vakoc, Andersson and Jeandesbosz.
This attack is unchallenged by a calm peloton so the quintet set off up the road, forming the day's breakaway.
With 60 kilometres left, their gap is at just over 4 minutes, with the chase being picked up behind by BNCR, Iberia and Die Berg, all wanting to bring the race back together for their big leaders.
This increase in pace doesn't deter attackers though. Delgado jumps out of the bunch a few kilometres later, setting off in pursuit of the breakaway.
The Venezuelan does an impressive job in crossing the gap, making the junction on the third-to-last climb of the day. He immediately moves onto the front of the group to set the pace, and to try to maintain the gap the breakaway group has of 3'30".
Behind, the gap is still under control despite the new presence in the front group. Adira move to the front now, keeping the good tempo up on one of the rare bits of flat road.
Moving onto the penultimate ascent, 40 kilometres left, Delgado really starts to push, as the gap drops below 2'30". He'll have to do something special to get a result from here, which the first step must be to drop his fellow attackers, who are doing well to hold on.
Soon enough though, the five early breakaway members are cracked by the superior Delgado. He holds his 2'30" gap to the top of the climb.
On the final descent, the bunch has a further increase in pace, with Sanchez Gonzalez deciding to use his descending skills to aid the chase of Delgado and the other attackers behind him.
Hitting the enormous 25 kilometre final climb, the Venezuelan has a two minute advantage over the peloton. It'll be tough going from here on, though.
Behind, the first attacks begin to come as the final climb is hit and the early break is caught. Colorado leads an offensive move, with Moreno, Cabreira and Arroyo all joining him.
That's quickly shut down though, and Barca and Iberia return to set the pace. The 22-man group has closed the gap to 1 minute as the last 15 kilometres are entered.
Delgado keeps on tapping out a tempo, but his gap is now declining quickly and is on the verge of shutting completely with the last 10 kilometres nearing.
Under that mark, the main group is down to six men as Arroyo decides to take control. With him are Colorado, Moreno, Cabreira, Menchov and Rojas Villegas.
Off the back already are riders like Esquivel, Parra Busstamunte, Nieve and Rodriguez Oliver. Their top-five chances have gone.
As the catch is made a couple of kilometres later, Arroyo shifts up a gear once more! Colorado and Moreno can stick with him, but the others are too tired.
That left three, nearing the end of this massive mountain. Didi decides to make an appearance, cheering on the front trio.
Meanwhile, Delgado has unsurprisingly been dropped from the second group on the road, leaving Menchov, Cabreira and Esquivel remaining in the battle for fourth.
Back at the front, the summit is in sight, and Colorado has cracked. Moreno is the only one left now with the mighty Arroyo.
But he can't hang on either now as the gradient kicks up! That means the victory is surely decided now.
The Spaniard rides into the final kilometre all alone, putting big gaps into the men behind him.
Arroyo takes the win here in Costa Rica, and he never looked like losing to be honest. A brilliant ride.
Moreno manages to stay ahead of Colorado, and they finish 2nd and 3rd respectively. Solid results for both, but Boeing especially should be pleased with that. Not many expected Colorado to do this well.
Rojas Villegas is the first Costa Rican home in an impressive fourth, with Menchov rounding off the top five after outsprinting Cabreira.
Also finishing in the top 10 today were Esquivel, Delgado, Monsalve and Parra Bustamante, who all put in decent performances.
Also, unsurprisingly many riders couldn't make it to the finish line. Here is a full list of the riders who didn't make it:
