Canada's Dylan Armstrong failed to qualify for the men's shot put final at the IAAF World Indoor Championships in Istanbul on Friday.

Armstrong, the reigning Diamond League champion and the silver medallist at last year's outdoor worlds, fell 20 centimetres short of the eighth and final qualifying spot with a throw of 19.84 metres. That's well below the world-leading distance of 22.21 metres Armstrong tossed at last summer's Canadian track and field championships.

Armstrong faulted on two of his three attempts.

The Kamloops, B.C., native said he was bothered by an arm injury, but that it's not a "long-term concern."

"My arm has been sore, it flared up before I left but it got better and I was hoping there wasn’t going to be any issues," Armstrong said, according to Athletics Canada's Twitter feed.

"[It] flared up on me again so I was hesitant in the circle to push hard and risk any serious injury."

Outdoor world champion David Storl of Germany, Olympic champion Tomasz Majewski of Poland and Reese Hoffa of the U.S., all advanced directly to the final by reaching the automatic qualifying distance of 20.70 metres.

In the final, Ryan Whiting of the U.S. won gold with a world-leading throw of 22.00 metres. Storl (21.88) finished second and Majewski (21.72) was third.

Canada's Holder, Warner, LeBlanc advance

Toronto's Nikkita Holder advanced to Saturday's semifinals of the 60-metre hurdles. The 24-year-old was third in her heat and posted the fifth-fastest time overall of 8.15 seconds.

"I'm happy to move onto the next round," Holder said. "This is my first world indoors and I wanted to make sure I didn't false start.

"I had a slow start but came on stronger over the last few hurdles, looking to build on that for next round."

Australian Sally Pearson lived up to her billing. She set a continental record of 7.85 in the hurdles heats and saw one of her toughest rivals, American hurdler Kristi Castlin, fail to finish her race since she thought everyone would be pulled back for a false start.

Toronto's Justyn Warner and New Brunswick's Michael Leblanc both qualified for Saturday's semifinals in the men's 60-metre dash by finishing second in their respective heats.

"I came here with the objective of making the final, today was the first step towards that," Warner said, according to Athletics Canada's Twitter feed.

Many racers complained about the starting gun and tough acoustics in the Atakoy Arena.

"iaaf needs to get their act together with this gun!" Warner wrote on his own Twitter feed.

Dobrynska breaks pentathlon record

Nataliya Dobrynska set a world record in the pentathlon, showing she is ready for a repeat Olympic gold medal at the London Games.

The 2008 heptathlon champion upstaged defending champion Jessica Ennis and Tatyana Chernova with a sterling long jump and a gutsy concluding 800 metres to become the first woman to break the 5,000-point mark in the five-event discipline. 

She beat the 20-year-old mark of Irina Belova with a score of 5,013 points. Dobrynska was only nine years old when the Russian set the old record of 4,991 points.

"I was confident that I could do it here," Dobrynska said. "I was mentally ready for this record for a long time."

Ennis, who led through the first three events, was left with silver and a British record 4,965 points, and Austra Skujyte set a Lithuanian record of 4,802 for bronze. Outdoor heptathlon world champion Chernova finished fifth.

"It is the worst feeling you could ever have, seeing your name in first place and then in second," Ennis said. "I need to make sure I learn from these experiences, get it right and turn silver into gold this summer," said Ennis, who is one of the host nation's most bankable Olympic stars.

It was only the second gold for Dobrynska after she also upset the favourites at the 2008 Beijing Olympics. She had been waiting to get the record for a long time.

"There was always a little something going wrong that prevented me from breaking it," she said.

But not Friday at the world championships, when her feat earned her a payday of $90,000 US.

Defar dominates 3,000 heat

In a packed morning program, Ethiopian great Meseret Defar set off on her quest to become the first female athlete to win five world indoor gold medals in a row, easily winning her 3,000 heat.

"My feeling is good and my shape is good," Defar said.

Farah-Legat showdown disappoints

If the Ennis-Chernova duel turned into a one-woman show for Dobrynska, the 3,000 face-off between British runner Mo Farah and American rival Bernard Lagat also failed to deliver.

Instead of reigning regally over the heat they shared, they had to scramble up to the line to secure their places in the final as five went for the line with four places available. Within a jumble of .30 seconds, Farah was second and Lagat was third.

High jump champs move on

In the high jump, world champion Anna Chicherova eased into the final, clearing 1.95 metres without missing a single jump.

Chaunte Howard Lowe of the United States also went over the qualifying height and was joined by Olympic champion Tia Hellebaut, who was facing elimination when she cleared 1.92 on her third and final attempt.

In the 400, Sanya Richards-Ross and Aleksandra Fedoriva won their heats to advance to Saturday's final.

With files from The Canadian Press & The Associated Press