European stock markets followed Asia higher, with blue-chip stock markets in London, Paris and Frankfurt up 0.2 to 0.5 percent in early Monday trade. She is testifying before the House Wednesday and the Senate on Thursday. Devon Energy rose 81 cents, or 2.7 percent, to $30.54.
KEEPING SCORE: The Standard & Poor's 500 index fell 1 point, or 0.1 percent, to 2,425 as of 2:23 p.m.
YELLEN FACTOR: Traders are looking ahead to potential news out of the Federal Reserve when Yellen addresses Congress on Wednesday and Thursday. US gold futures for August delivery fell 0.2 percent to $1,210.50 per ounce.
Spot gold is expected to rise into a range of between $1,225 and 1,231 per ounce, as suggested by its wave pattern and a Fibonacci projection analysis, according to Reuters technical analyst, Wang Tao.
International Container Terminal Services was among the biggest gainers on the index, climbing as much as 2.6 percent, after signing an agreement with a dredging company to deepen the Congo River in Africa, a move that would realise cost savings for the terminal operator from 2018.
Halcon Resources Corp's shares were up 40 percent after the oil producer said on Tuesday it would sell assets it operates in the Williston Basin to Bruin E&P Partners for $1.4 billion in cash.
Britain's FTSE 100 fell 0.8 percent to 7,308 and the CAC40 of France lost 0.3 percent to 5,152.
EXECUTIVE SHUFFLE: Citrix Systems fell 1.8 percent after the business software company announced that CEO Kirill Tatarinov has been replaced by David Henshall, the company's chief financial officer.
OIL & GAS: The price of oil rebounded after dipping earlier in the day.
Among oil stocks, Santos is adding 0.3 percent and Woodside Petroleum is edging up less than 0.1 percent, while Oil Search is lower by nearly 1 percent.
Gold prices are down more than 6 per cent from a seven-month high near US$1,300 hit in June.
"The pullback in gold has coincided with the rise in US real yields to the year's highs as well as the sharp increase in real yields in Europe to the highest levels in more than a year", UBS analysts said in a note.
BONDS: Bond prices were little changed.
Tokyo's benchmark Nikkei 225 index gained 0.57 percent, or 114.50 points, to 20,195.48, while the Topix index of all first-section issues advanced 0.72 percent, or 11.66 points, to 1,627.14.
Seoul added 0.6 percent, with Taipei more than one percent up and Wellington 0.6 percent higher.